summaryrefslogtreecommitdiff
path: root/net
diff options
context:
space:
mode:
authorWilly Tarreau <w@1wt.eu>2012-05-17 11:14:14 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-05-21 09:40:03 -0700
commit6e29cea334bf13fcb19f20cc80b65f9a1f2f329e (patch)
tree622971fcb060594f8ce8b3c4408a8fbc1cf0051d /net
parentf4f388bce9ef18d7ab4e234495d52cc7e716ab3b (diff)
tcp: do_tcp_sendpages() must try to push data out on oom conditions
commit bad115cfe5b509043b684d3a007ab54b80090aa1 upstream. Since recent changes on TCP splicing (starting with commits 2f533844 "tcp: allow splice() to build full TSO packets" and 35f9c09f "tcp: tcp_sendpages() should call tcp_push() once"), I started seeing massive stalls when forwarding traffic between two sockets using splice() when pipe buffers were larger than socket buffers. Latest changes (net: netdev_alloc_skb() use build_skb()) made the problem even more apparent. The reason seems to be that if do_tcp_sendpages() fails on out of memory condition without being able to send at least one byte, tcp_push() is not called and the buffers cannot be flushed. After applying the attached patch, I cannot reproduce the stalls at all and the data rate it perfectly stable and steady under any condition which previously caused the problem to be permanent. The issue seems to have been there since before the kernel migrated to git, which makes me think that the stalls I occasionally experienced with tux during stress-tests years ago were probably related to the same issue. This issue was first encountered on 3.0.31 and 3.2.17, so please backport to -stable. Signed-off-by: Willy Tarreau <w@1wt.eu> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/tcp.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 74f84a483ead..6db041d3284c 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -850,8 +850,7 @@ new_segment:
wait_for_sndbuf:
set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
wait_for_memory:
- if (copied)
- tcp_push(sk, flags & ~MSG_MORE, mss_now, TCP_NAGLE_PUSH);
+ tcp_push(sk, flags & ~MSG_MORE, mss_now, TCP_NAGLE_PUSH);
if ((err = sk_stream_wait_memory(sk, &timeo)) != 0)
goto do_error;