Kamil Dudka
11 years ago
parent
0908d2fabd
commit
5881ed4686
@ -0,0 +1,45 @@
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From d0a263ef805244245afd9b709bdd3dc733113a6c Mon Sep 17 00:00:00 2001
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From: Daniel Stenberg <daniel@haxx.se>
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Date: Sat, 7 Sep 2013 13:41:14 +0200
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Subject: [PATCH 06/11] _libssh2_channel_write: client spins on write when window full
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When there's no window to "write to", there's no point in waiting for
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the socket to become writable since it most likely just will continue to
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be.
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Patch-by: ncm
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Fixes #258
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[upstream commit e6c46cc249227de7b7cd136d72eded5dcb3f9381]
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
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---
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src/channel.c | 10 +++++++++-
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1 files changed, 9 insertions(+), 1 deletions(-)
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diff --git a/src/channel.c b/src/channel.c
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index 9f2c241..74262d8 100644
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--- a/src/channel.c
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+++ b/src/channel.c
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@@ -2039,9 +2039,17 @@ _libssh2_channel_write(LIBSSH2_CHANNEL *channel, int stream_id,
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if((rc < 0) && (rc != LIBSSH2_ERROR_EAGAIN))
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return rc;
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- if(channel->local.window_size <= 0)
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+ if(channel->local.window_size <= 0) {
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/* there's no room for data so we stop */
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+
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+ /* Waiting on the socket to be writable would be wrong because we
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+ * would be back here immediately, but a readable socket might
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+ * herald an incoming window adjustment.
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+ */
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+ session->socket_block_directions = LIBSSH2_SESSION_BLOCK_INBOUND;
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+
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return (rc==LIBSSH2_ERROR_EAGAIN?rc:0);
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+ }
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channel->write_bufwrite = buflen;
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--
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1.7.1
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@ -0,0 +1,146 @@
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From 8af6637d86b6a85e8889c286f7ff3d841fc5621c Mon Sep 17 00:00:00 2001
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From: Salvador Fandino <sfandino@yahoo.com>
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Date: Sat, 12 Oct 2013 02:51:46 +0200
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Subject: [PATCH 07/11] window_size: redid window handling for flow control reasons
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Until now, the window size (channel->remote.window_size) was being
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updated just after receiving the packet from the transport layer.
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That behaviour is wrong because the channel queue may grow uncontrolled
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when data arrives from the network faster that the upper layer consumes
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it.
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This patch adds a new counter, read_avail, which keeps a count of the
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bytes available from the packet queue for reading. Also, now the window
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size is adjusted when the data is actually read by an upper layer.
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That way, if the upper layer stops reading data, the window will
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eventually fill and the remote host will stop sending data. When the
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upper layers reads enough data, a window adjust packet is delivered and
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the transfer resumes.
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The read_avail counter is used to detect the situation when the remote
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server tries to send data surpassing the window size. In that case, the
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extra data is discarded.
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Signed-off-by: Salvador <sfandino@yahoo.com>
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[upstream commit cdeef54967ed5b7d5bd8fa6da5851aa3d173faa0]
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
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---
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src/channel.c | 8 +++++++-
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src/libssh2_priv.h | 2 ++
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src/packet.c | 35 ++++++++++++++++++++++++++++-------
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3 files changed, 37 insertions(+), 8 deletions(-)
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diff --git a/src/channel.c b/src/channel.c
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index 74262d8..499d815 100644
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--- a/src/channel.c
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+++ b/src/channel.c
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@@ -1411,6 +1411,9 @@ _libssh2_channel_flush(LIBSSH2_CHANNEL *channel, int streamid)
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channel->flush_state = libssh2_NB_state_created;
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}
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+ channel->read_avail -= channel->flush_flush_bytes;
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+ channel->remote.window_size -= channel->flush_flush_bytes;
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+
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if (channel->flush_refund_bytes) {
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int rc;
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@@ -1868,11 +1871,14 @@ ssize_t _libssh2_channel_read(LIBSSH2_CHANNEL *channel, int stream_id,
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/* if the transport layer said EAGAIN then we say so as well */
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return _libssh2_error(session, rc, "would block");
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}
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- else
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+ else {
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+ channel->read_avail -= bytes_read;
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+ channel->remote.window_size -= bytes_read;
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/* make sure we remain in the created state to focus on emptying the
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data we already have in the packet brigade before we try to read
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more off the network again */
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channel->read_state = libssh2_NB_state_created;
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+ }
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if(channel->remote.window_size < (LIBSSH2_CHANNEL_WINDOW_DEFAULT*30)) {
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/* the window is getting too narrow, expand it! */
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diff --git a/src/libssh2_priv.h b/src/libssh2_priv.h
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index 4ec9f73..fcf4370 100644
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--- a/src/libssh2_priv.h
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+++ b/src/libssh2_priv.h
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@@ -357,6 +357,8 @@ struct _LIBSSH2_CHANNEL
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libssh2_channel_data local, remote;
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/* Amount of bytes to be refunded to receive window (but not yet sent) */
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uint32_t adjust_queue;
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+ /* Data immediately available for reading */
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+ uint32_t read_avail;
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LIBSSH2_SESSION *session;
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diff --git a/src/packet.c b/src/packet.c
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index bfbd56a..d2e758c 100644
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--- a/src/packet.c
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+++ b/src/packet.c
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@@ -653,6 +653,18 @@ _libssh2_packet_add(LIBSSH2_SESSION * session, unsigned char *data,
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_libssh2_debug(session, LIBSSH2_TRACE_CONN,
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"Ignoring extended data and refunding %d bytes",
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(int) (datalen - 13));
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+ if (channelp->read_avail + datalen - data_head >=
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+ channelp->remote.window_size)
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+ datalen = channelp->remote.window_size -
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+ channelp->read_avail + data_head;
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+
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+ channelp->remote.window_size -= datalen - data_head;
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+ _libssh2_debug(session, LIBSSH2_TRACE_CONN,
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+ "shrinking window size by %lu bytes to %lu, read_avail %lu",
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+ datalen - data_head,
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+ channelp->remote.window_size,
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+ channelp->read_avail);
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+
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session->packAdd_channelp = channelp;
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/* Adjust the window based on the block we just freed */
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@@ -684,7 +696,7 @@ _libssh2_packet_add(LIBSSH2_SESSION * session, unsigned char *data,
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" to receive, truncating");
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datalen = channelp->remote.packet_size + data_head;
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}
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- if (channelp->remote.window_size <= 0) {
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+ if (channelp->remote.window_size <= channelp->read_avail) {
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/*
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* Spec says we MAY ignore bytes sent beyond
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* window_size
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@@ -700,17 +712,26 @@ _libssh2_packet_add(LIBSSH2_SESSION * session, unsigned char *data,
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/* Reset EOF status */
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channelp->remote.eof = 0;
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- if ((datalen - data_head) > channelp->remote.window_size) {
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+ if (channelp->read_avail + datalen - data_head >
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+ channelp->remote.window_size) {
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_libssh2_error(session,
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LIBSSH2_ERROR_CHANNEL_WINDOW_EXCEEDED,
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"Remote sent more data than current "
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"window allows, truncating");
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- datalen = channelp->remote.window_size + data_head;
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- channelp->remote.window_size = 0;
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+ datalen = channelp->remote.window_size -
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+ channelp->read_avail + data_head;
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}
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- else
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- /* Now that we've received it, shrink our window */
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- channelp->remote.window_size -= datalen - data_head;
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+
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+ /* Update the read_avail counter. The window size will be
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+ * updated once the data is actually read from the queue
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+ * from an upper layer */
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+ channelp->read_avail += datalen - data_head;
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+
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+ _libssh2_debug(session, LIBSSH2_TRACE_CONN,
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+ "increasing read_avail by %lu bytes to %lu/%lu",
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+ (long)(datalen - data_head),
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+ (long)channelp->read_avail,
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+ (long)channelp->remote.window_size);
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break;
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--
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1.7.1
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@ -0,0 +1,140 @@
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From cae2385ba898f71038ed4dd00ddae02f85e588e7 Mon Sep 17 00:00:00 2001
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From: Salvador <sfandino@yahoo.com>
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Date: Tue, 15 Oct 2013 11:45:10 +0200
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Subject: [PATCH 08/11] _libssh2_channel_read: fix data drop when out of window
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After filling the read buffer with data from the read queue, when the
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window size was too small, "libssh2_channel_receive_window_adjust" was
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called to increase it. In non-blocking mode that function could return
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EAGAIN and, in that case, the EAGAIN was propagated upwards and the data
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already read on the buffer lost.
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The function was also moving between the two read states
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"libssh2_NB_state_idle" and "libssh2_NB_state_created" both of which
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behave in the same way (excepting a debug statment).
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This commit modifies "_libssh2_channel_read" so that the
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"libssh2_channel_receive_window_adjust" call is performed first (when
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required) and if everything goes well, then it reads the data from the
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queued packets into the read buffer.
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It also removes the useless "libssh2_NB_state_created" read state.
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Some rotted comments have also been updated.
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Signed-off-by: Salvador <sfandino@yahoo.com>
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[upstream commit 27f9ac2549b7721cf9d857022c0e7a311830b367]
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
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---
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src/channel.c | 75 +++++++++++++++++++--------------------------------------
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1 files changed, 25 insertions(+), 50 deletions(-)
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diff --git a/src/channel.c b/src/channel.c
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index 499d815..82f6980 100644
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--- a/src/channel.c
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+++ b/src/channel.c
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@@ -1751,31 +1751,33 @@ ssize_t _libssh2_channel_read(LIBSSH2_CHANNEL *channel, int stream_id,
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LIBSSH2_PACKET *read_packet;
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LIBSSH2_PACKET *read_next;
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- if (channel->read_state == libssh2_NB_state_idle) {
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- _libssh2_debug(session, LIBSSH2_TRACE_CONN,
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- "channel_read() wants %d bytes from channel %lu/%lu "
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- "stream #%d",
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- (int) buflen, channel->local.id, channel->remote.id,
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- stream_id);
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- channel->read_state = libssh2_NB_state_created;
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- }
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+ _libssh2_debug(session, LIBSSH2_TRACE_CONN,
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+ "channel_read() wants %d bytes from channel %lu/%lu "
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+ "stream #%d",
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+ (int) buflen, channel->local.id, channel->remote.id,
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+ stream_id);
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- /*
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- * =============================== NOTE ===============================
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- * I know this is very ugly and not a really good use of "goto", but
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- * this case statement would be even uglier to do it any other way
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- */
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- if (channel->read_state == libssh2_NB_state_jump1) {
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- goto channel_read_window_adjust;
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- }
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+ /* expand the receiving window first if it has become too narrow */
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+ if((channel->read_state == libssh2_NB_state_jump1) ||
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+ (channel->remote.window_size < (LIBSSH2_CHANNEL_WINDOW_DEFAULT*30))) {
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+
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+ /* the actual window adjusting may not finish so we need to deal with
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+ this special state here */
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+ channel->read_state = libssh2_NB_state_jump1;
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+ rc = _libssh2_channel_receive_window_adjust(channel,
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+ (LIBSSH2_CHANNEL_WINDOW_DEFAULT*60),
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+ 0, NULL);
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+ if (rc)
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+ return rc;
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- rc = 1; /* set to >0 to let the while loop start */
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+ channel->read_state = libssh2_NB_state_idle;
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+ }
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- /* Process all pending incoming packets in all states in order to "even
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- out" the network readings. Tests prove that this way produces faster
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- transfers. */
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- while (rc > 0)
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+ /* Process all pending incoming packets. Tests prove that this way
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+ produces faster transfers. */
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+ do {
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rc = _libssh2_transport_read(session);
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+ } while (rc > 0);
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if ((rc < 0) && (rc != LIBSSH2_ERROR_EAGAIN))
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return _libssh2_error(session, rc, "transport read");
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@@ -1857,8 +1859,6 @@ ssize_t _libssh2_channel_read(LIBSSH2_CHANNEL *channel, int stream_id,
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}
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if (!bytes_read) {
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- channel->read_state = libssh2_NB_state_idle;
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-
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/* If the channel is already at EOF or even closed, we need to signal
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that back. We may have gotten that info while draining the incoming
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transport layer until EAGAIN so we must not be fooled by that
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@@ -1871,34 +1871,9 @@ ssize_t _libssh2_channel_read(LIBSSH2_CHANNEL *channel, int stream_id,
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/* if the transport layer said EAGAIN then we say so as well */
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return _libssh2_error(session, rc, "would block");
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}
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- else {
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- channel->read_avail -= bytes_read;
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- channel->remote.window_size -= bytes_read;
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- /* make sure we remain in the created state to focus on emptying the
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- data we already have in the packet brigade before we try to read
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- more off the network again */
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- channel->read_state = libssh2_NB_state_created;
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- }
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-
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- if(channel->remote.window_size < (LIBSSH2_CHANNEL_WINDOW_DEFAULT*30)) {
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- /* the window is getting too narrow, expand it! */
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-
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- channel_read_window_adjust:
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- channel->read_state = libssh2_NB_state_jump1;
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- /* the actual window adjusting may not finish so we need to deal with
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- this special state here */
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- rc = _libssh2_channel_receive_window_adjust(channel,
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- (LIBSSH2_CHANNEL_WINDOW_DEFAULT*60), 0, NULL);
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- if (rc)
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- return rc;
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- _libssh2_debug(session, LIBSSH2_TRACE_CONN,
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- "channel_read() filled %d adjusted %d",
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- bytes_read, buflen);
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- /* continue in 'created' state to drain the already read packages
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- first before starting to empty the socket further */
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- channel->read_state = libssh2_NB_state_created;
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- }
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+ channel->read_avail -= bytes_read;
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+ channel->remote.window_size -= bytes_read;
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return bytes_read;
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}
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--
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1.7.1
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@ -0,0 +1,62 @@
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From 5c14f0e6ecfe73da86d3ad20edd60c4756037935 Mon Sep 17 00:00:00 2001
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From: Salvador <sfandino-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
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Date: Wed, 16 Oct 2013 13:31:31 +0200
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Subject: [PATCH 09/11] _libssh2_channel_read: Honour window_size_initial
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_libssh2_channel_read was using an arbitrary hard-coded limit to trigger
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the window adjusting code. The adjustment used was also hard-coded and
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arbitrary, 15MB actually, which would limit the usability of libssh2 on
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systems with little RAM.
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This patch, uses the window_size parameter passed to
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libssh2_channel_open_ex (stored as remote.window_size_initial) plus the
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buflen as the base for the trigger and the adjustment calculation.
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The memory usage when using the default window size is reduced from 22MB
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to 256KB per channel (actually, if compression is used, these numbers
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should be incremented by ~50% to account for the errors between the
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decompressed packet sizes and the predicted sizes).
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My tests indicate that this change does not impact the performance of
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transfers across localhost or a LAN, being it on par with that of
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OpenSSH. On the other hand, it will probably slow down transfers on
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networks with high bandwidth*delay when the default window size
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(LIBSSH2_CHANNEL_WINDOW_DEFAULT=256KB) is used.
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|
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Signed-off-by: Salvador Fandino <sfandino@yahoo.com>
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[upstream commit 1b3307dda0c58d9023a657747592ac86703b1ff4]
|
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Signed-off-by: Kamil Dudka <kdudka@redhat.com>
|
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---
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src/channel.c | 11 +++++++----
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1 files changed, 7 insertions(+), 4 deletions(-)
|
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diff --git a/src/channel.c b/src/channel.c
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index 82f6980..36c75d2 100644
|
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--- a/src/channel.c
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+++ b/src/channel.c
|
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@@ -1758,14 +1758,17 @@ ssize_t _libssh2_channel_read(LIBSSH2_CHANNEL *channel, int stream_id,
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stream_id);
|
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|
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/* expand the receiving window first if it has become too narrow */
|
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- if((channel->read_state == libssh2_NB_state_jump1) ||
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- (channel->remote.window_size < (LIBSSH2_CHANNEL_WINDOW_DEFAULT*30))) {
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+ if( (channel->read_state == libssh2_NB_state_jump1) ||
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+ (channel->remote.window_size < channel->remote.window_size_initial / 4 * 3 + buflen) ) {
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+
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+ uint32_t adjustment = channel->remote.window_size_initial + buflen - channel->remote.window_size;
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+ if (adjustment < LIBSSH2_CHANNEL_MINADJUST)
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+ adjustment = LIBSSH2_CHANNEL_MINADJUST;
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/* the actual window adjusting may not finish so we need to deal with
|
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this special state here */
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channel->read_state = libssh2_NB_state_jump1;
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- rc = _libssh2_channel_receive_window_adjust(channel,
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- (LIBSSH2_CHANNEL_WINDOW_DEFAULT*60),
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+ rc = _libssh2_channel_receive_window_adjust(channel, adjustment,
|
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0, NULL);
|
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if (rc)
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return rc;
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--
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1.7.1
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@ -0,0 +1,85 @@
|
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From 0a758095c40ae1b32dc5052a706a16c2d9ac5742 Mon Sep 17 00:00:00 2001
|
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From: Salvador Fandino <sfandino@yahoo.com>
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Date: Mon, 21 Oct 2013 11:58:55 +0200
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Subject: [PATCH 10/11] Set default window size to 2MB
|
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|
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The default channel window size used until now was 256KB. This value is
|
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too small and results on a bottleneck on real-life networks where
|
||||
round-trip delays can easily reach 300ms.
|
||||
|
||||
The issue was not visible because the configured channel window size
|
||||
was being ignored and a hard-coded value of ~22MB being used instead,
|
||||
but that was fixed on a previous commit.
|
||||
|
||||
This patch just changes the default window size
|
||||
(LIBSSH2_CHANNEL_WINDOW_DEFAULT) to 2MB. It is the same value used by
|
||||
OpenSSH and in our opinion represents a good compromise between memory
|
||||
used and transfer speed.
|
||||
|
||||
Performance tests were run to determine the optimum value. The details
|
||||
and related discussion are available from the following thread on the
|
||||
libssh2 mailing-list:
|
||||
|
||||
http://www.libssh2.org/mail/libssh2-devel-archive-2013-10/0018.shtml
|
||||
http://article.gmane.org/gmane.network.ssh.libssh2.devel/6543
|
||||
|
||||
An excerpt follows:
|
||||
|
||||
"I have been running some transfer test and measuring their speed.
|
||||
|
||||
My setup was composed of a quad-core Linux machine running Ubuntu 13.10
|
||||
x86_64 with a LXC container inside. The data transfers were performed
|
||||
from the container to the host (never crossing through a physical
|
||||
network device).
|
||||
|
||||
Network delays were simulated using the tc tool. And ping was used to
|
||||
verify that they worked as intended during the tests.
|
||||
|
||||
The operation performed was the equivalent to the following ssh command:
|
||||
|
||||
$ ssh container "dd bs=16K count=8K if=/dev/zero" >/dev/null
|
||||
|
||||
Though, establishment and closing of the SSH connection was excluded
|
||||
from the timings.
|
||||
|
||||
I run the tests several times transferring files of sizes up to 128MB
|
||||
and the results were consistent between runs.
|
||||
|
||||
The results corresponding to the 128MB transfer are available here:
|
||||
|
||||
https://docs.google.com/spreadsheet/ccc?key=0Ao1yRmX6PQQzdG5wSFlrZl9HRWNET3ZyN0hnaGo5ZFE&usp=sharing
|
||||
|
||||
It clearly shows that 256KB is too small as the default window size.
|
||||
Moving to a 512MB generates a great improvement and after the 1MB mark
|
||||
the returns rapidly diminish. Other factors (TCP window size, probably)
|
||||
become more limiting than the channel window size
|
||||
|
||||
For comparison I also performed the same transfers using OpenSSH. Its
|
||||
speed is usually on par with that of libssh2 using a window size of 1MB
|
||||
(even if it uses a 2MB window, maybe it is less aggressive sending the
|
||||
window adjust msgs)."
|
||||
|
||||
Signed-off-by: Salvador Fandino <sfandino@yahoo.com>
|
||||
|
||||
[upstream commit 85a827d1bceb9abd4442f225dd7c65ef5cefdc32]
|
||||
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
|
||||
---
|
||||
include/libssh2.h | 2 +-
|
||||
1 files changed, 1 insertions(+), 1 deletions(-)
|
||||
|
||||
diff --git a/include/libssh2.h b/include/libssh2.h
|
||||
index 9b1a6e1..df873fc 100644
|
||||
--- a/include/libssh2.h
|
||||
+++ b/include/libssh2.h
|
||||
@@ -587,7 +587,7 @@ LIBSSH2_API int libssh2_poll(LIBSSH2_POLLFD *fds, unsigned int nfds,
|
||||
long timeout);
|
||||
|
||||
/* Channel API */
|
||||
-#define LIBSSH2_CHANNEL_WINDOW_DEFAULT (256*1024)
|
||||
+#define LIBSSH2_CHANNEL_WINDOW_DEFAULT (2*1024*1024)
|
||||
#define LIBSSH2_CHANNEL_PACKET_DEFAULT 32768
|
||||
#define LIBSSH2_CHANNEL_MINADJUST 1024
|
||||
|
||||
--
|
||||
1.7.1
|
||||
|
||||
@ -0,0 +1,66 @@
|
||||
From baadc811a703b9a6dec655c7afb3218d8cff51fa Mon Sep 17 00:00:00 2001
|
||||
From: Daniel Stenberg <daniel@haxx.se>
|
||||
Date: Sun, 16 Mar 2014 20:02:37 +0100
|
||||
Subject: [PATCH 11/11] channel_receive_window_adjust: store windows size always
|
||||
|
||||
Avoid it sometimes returning without storing it, leaving calling
|
||||
functions with unknown content!
|
||||
|
||||
Detected by clang-analyzer
|
||||
|
||||
[upstream commit fcb601da7b37c6e9bbcd264199597e2ddb7bc347]
|
||||
|
||||
Signed-off-by: Kamil Dudka <kdudka@redhat.com>
|
||||
---
|
||||
src/channel.c | 11 ++++-------
|
||||
1 files changed, 4 insertions(+), 7 deletions(-)
|
||||
|
||||
diff --git a/src/channel.c b/src/channel.c
|
||||
index 36c75d2..1d074df 100644
|
||||
--- a/src/channel.c
|
||||
+++ b/src/channel.c
|
||||
@@ -1,6 +1,6 @@
|
||||
/* Copyright (c) 2004-2007 Sara Golemon <sarag@libssh2.org>
|
||||
* Copyright (c) 2005 Mikhail Gusarov <dottedmag@dottedmag.net>
|
||||
- * Copyright (c) 2008-2011 by Daniel Stenberg
|
||||
+ * Copyright (c) 2008-2014 by Daniel Stenberg
|
||||
*
|
||||
* All rights reserved.
|
||||
*
|
||||
@@ -1544,6 +1544,9 @@ _libssh2_channel_receive_window_adjust(LIBSSH2_CHANNEL * channel,
|
||||
{
|
||||
int rc;
|
||||
|
||||
+ if(store)
|
||||
+ *store = channel->remote.window_size;
|
||||
+
|
||||
if (channel->adjust_state == libssh2_NB_state_idle) {
|
||||
if (!force
|
||||
&& (adjustment + channel->adjust_queue <
|
||||
@@ -1553,14 +1556,10 @@ _libssh2_channel_receive_window_adjust(LIBSSH2_CHANNEL * channel,
|
||||
"for channel %lu/%lu",
|
||||
adjustment, channel->local.id, channel->remote.id);
|
||||
channel->adjust_queue += adjustment;
|
||||
- if(store)
|
||||
- *store = channel->remote.window_size;
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (!adjustment && !channel->adjust_queue) {
|
||||
- if(store)
|
||||
- *store = channel->remote.window_size;
|
||||
return 0;
|
||||
}
|
||||
|
||||
@@ -1598,8 +1597,6 @@ _libssh2_channel_receive_window_adjust(LIBSSH2_CHANNEL * channel,
|
||||
|
||||
channel->adjust_state = libssh2_NB_state_idle;
|
||||
|
||||
- if(store)
|
||||
- *store = channel->remote.window_size;
|
||||
return 0;
|
||||
}
|
||||
|
||||
--
|
||||
1.7.1
|
||||
|
||||
Loading…
Reference in new issue