Willy Tarreau bad115cfe5 tcp: do_tcp_sendpages() must try to push data out on oom conditions ... 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> Cc: <stable@vger.kernel.org>		2012-05-17 18:31:43 -04:00
..
netfilter	netfilter: nf_ct_ipv4: packets with wrong ihl are invalid	2012-04-10 12:50:49 +02:00
Kconfig	net: Fix build regression when INET_UDP_DIAG=y and IPV6=m	2012-02-07 13:35:28 -05:00
Makefile	tcp memory pressure controls	2011-12-12 19:04:10 -05:00
af_inet.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
ah4.c	net: ipv4: Standardize prefixes for message logging	2012-03-12 17:05:21 -07:00
arp.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
cipso_ipv4.c	ipv4: Convert call_rcu() to kfree_rcu(), drop opt_kfree_rcu()	2012-02-21 09:03:31 -08:00
datagram.c	ipv4: Lock socket and use cork flow in ip4_datagram_connect().	2011-05-08 13:48:57 -07:00
devinet.c	Disintegrate and delete asm/system.h	2012-03-28 15:58:21 -07:00
esp4.c	net: ipv4: Standardize prefixes for message logging	2012-03-12 17:05:21 -07:00
fib_frontend.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
fib_lookup.h	ipv4: Fix nexthop caching wrt. scoping.	2011-03-24 18:06:47 -07:00
fib_rules.c	net: ipv4: export fib_lookup and fib_table_lookup	2011-12-04 22:43:33 +01:00
fib_semantics.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
fib_trie.c	ipv4: Do not use dead fib_info entries.	2012-05-10 22:16:32 -04:00
gre.c	net: ipv4: Standardize prefixes for message logging	2012-03-12 17:05:21 -07:00
icmp.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
igmp.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
inet_connection_sock.c	tcp: bind() optimize port allocation	2012-01-25 21:50:43 -05:00
inet_diag.c	udp_diag: implement idiag_get_info for udp/udplite to get queue information	2012-04-25 20:43:01 -04:00
inet_fragment.c	net/ipv4: EXPORT_SYMBOL cleanups	2010-07-12 12:57:54 -07:00
inet_hashtables.c	net: Compute protocol sequence numbers and fragment IDs using MD5.	2011-08-06 18:33:19 -07:00
inet_lro.c	net: add skb frag size accessors	2011-10-19 03:10:46 -04:00
inet_timewait_sock.c	net: Fix files explicitly needing to include module.h	2011-10-31 19:30:28 -04:00
inetpeer.c	route: Remove redirect_genid	2012-03-08 00:30:32 -08:00
ip_forward.c	ipv4: Save nexthop address of LSRR/SSRR option to IPCB.	2011-11-23 19:19:32 -05:00
ip_fragment.c	net: ipv4: Standardize prefixes for message logging	2012-03-12 17:05:21 -07:00
ip_gre.c	net: ipv4: Standardize prefixes for message logging	2012-03-12 17:05:21 -07:00
ip_input.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
ip_options.c	net: ipv4: Standardize prefixes for message logging	2012-03-12 17:05:21 -07:00
ip_output.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
ip_sockglue.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2012-03-20 21:04:47 -07:00
ipcomp.c	net: Convert printks to pr_<level>	2012-03-11 23:42:51 -07:00
ipconfig.c	net: Convert printks to pr_<level>	2012-03-11 23:42:51 -07:00
ipip.c	net: Convert printks to pr_<level>	2012-03-11 23:42:51 -07:00
ipmr.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
netfilter.c	netfilter: possible unaligned packet header in ip_route_me_harder	2011-11-21 18:46:18 +01:00
ping.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
proc.c	tcp: reduce out_of_order memory use	2012-03-19 16:53:08 -04:00
protocol.c	net: add __rcu annotations to protocol	2010-10-27 11:37:31 -07:00
raw.c	net: Convert printks to pr_<level>	2012-03-11 23:42:51 -07:00
route.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2012-04-02 17:53:39 -07:00
syncookies.c	tcp: fix syncookie regression	2012-03-11 15:52:12 -07:00
sysctl_net_ipv4.c	tcp: properly initialize tcp memory limits	2012-02-02 14:34:41 -05:00
tcp.c	tcp: do_tcp_sendpages() must try to push data out on oom conditions	2012-05-17 18:31:43 -04:00
tcp_bic.c	tcp: fix undo after RTO for BIC	2012-01-20 14:17:26 -05:00
tcp_cong.c	net: ipv4: Standardize prefixes for message logging	2012-03-12 17:05:21 -07:00
tcp_cubic.c	tcp: fix undo after RTO for CUBIC	2012-01-20 14:17:26 -05:00
tcp_diag.c	inet_diag: Rename inet_diag_req into inet_diag_req_v2	2012-01-11 12:56:06 -08:00
tcp_highspeed.c	tcp: mark tcp_congestion_ops read_mostly	2011-03-10 00:40:17 -08:00
tcp_htcp.c	tcp: mark tcp_congestion_ops read_mostly	2011-03-10 00:40:17 -08:00
tcp_hybla.c	tcp: mark tcp_congestion_ops read_mostly	2011-03-10 00:40:17 -08:00
tcp_illinois.c	tcp: mark tcp_congestion_ops read_mostly	2011-03-10 00:40:17 -08:00
tcp_input.c	tcp: change tcp_adv_win_scale and tcp_rmem[2]	2012-05-02 21:08:58 -04:00
tcp_ipv4.c	dmaengine-fixes for 3.4-rc3	2012-04-10 15:30:16 -07:00
tcp_lp.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
tcp_memcontrol.c	Merge branch 'for-3.4' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2012-03-20 18:11:21 -07:00
tcp_minisocks.c	tcp: md5: rcu conversion	2012-01-31 12:14:00 -05:00
tcp_output.c	tcp: fix retransmit of partially acked frames	2012-04-18 16:52:45 -04:00
tcp_probe.c	net: ipv4: Standardize prefixes for message logging	2012-03-12 17:05:21 -07:00
tcp_scalable.c	tcp: mark tcp_congestion_ops read_mostly	2011-03-10 00:40:17 -08:00
tcp_timer.c	net: ipv4: Standardize prefixes for message logging	2012-03-12 17:05:21 -07:00
tcp_vegas.c	tcp: mark tcp_congestion_ops read_mostly	2011-03-10 00:40:17 -08:00
tcp_vegas.h	[TCP]: congestion control API pass RTT in microseconds	2007-07-31 02:27:57 -07:00
tcp_veno.c	tcp: mark tcp_congestion_ops read_mostly	2011-03-10 00:40:17 -08:00
tcp_westwood.c	tcp: mark tcp_congestion_ops read_mostly	2011-03-10 00:40:17 -08:00
tcp_yeah.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
tunnel4.c	net: Convert printks to pr_<level>	2012-03-11 23:42:51 -07:00
udp.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
udp_diag.c	udp_diag: implement idiag_get_info for udp/udplite to get queue information	2012-04-25 20:43:01 -04:00
udp_impl.h	net: Make setsockopt() optlen be unsigned.	2009-09-30 16:12:20 -07:00
udplite.c	net: ipv4: Standardize prefixes for message logging	2012-03-12 17:05:21 -07:00
xfrm4_input.c	net/ipv4: EXPORT_SYMBOL cleanups	2010-07-12 12:57:54 -07:00
xfrm4_mode_beet.c	ipsec: be careful of non existing mac headers	2012-02-23 16:50:45 -05:00
xfrm4_mode_transport.c	[IPSEC]: Use IPv6 calling convention as the convention for x->mode->output	2007-10-10 16:55:54 -07:00
xfrm4_mode_tunnel.c	ipsec: be careful of non existing mac headers	2012-02-23 16:50:45 -05:00
xfrm4_output.c	xfrm4: Don't call icmp_send on local error	2011-07-01 17:33:19 -07:00
xfrm4_policy.c	ipv4: fix ipsec forward performance regression	2011-10-24 03:01:22 -04:00
xfrm4_state.c	net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules	2011-10-31 19:30:30 -04:00
xfrm4_tunnel.c	net: ipv4: Standardize prefixes for message logging	2012-03-12 17:05:21 -07:00