Yuchung Cheng 989e04c5bc tcp: improve undo on timeout ... Upon timeout, undo (via both timestamps/Eifel and DSACKs) was disabled if any retransmits were still in flight. The concern was perhaps that spurious retransmission sent in a previous recovery episode may trigger DSACKs to falsely undo the current recovery. However, this inadvertently misses undo opportunities (using either TCP timestamps or DSACKs) when timeout occurs during a loss episode, i.e. recurring timeouts or timeout during fast recovery. In these cases some retransmissions will be in flight but we should allow undo. Furthermore, we should only reset undo_marker and undo_retrans upon timeout if we are starting a new recovery episode. Finally, when we do reset our undo state, we now do so in a manner similar to tcp_enter_recovery(), so that we require a DSACK for each of the outstsanding retransmissions. This will achieve the original goal by requiring that we receive the same number of DSACKs as retransmissions. This patch increases the undo events by 50% on Google servers. Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2014-08-22 21:28:02 -07:00
..
netfilter	netfilter: kill remnants of ulog targets	2014-07-25 14:55:44 +02:00
Kconfig	udp: Add udp_sock_create for UDP tunnels to open listener socket	2014-07-14 16:12:15 -07:00
Makefile	udp: Add udp_sock_create for UDP tunnels to open listener socket	2014-07-14 16:12:15 -07:00
af_inet.c	net-gre-gro: Fix a bug that breaks the forwarding path	2014-07-16 14:45:26 -07:00
ah4.c	…
arp.c	…
cipso_ipv4.c	netlabel: shorter names for the NetLabel catmap funcs/structs	2014-08-01 11:17:37 -04:00
datagram.c	net: Save TX flow hash in sock and set in skbuf on xmit	2014-07-07 21:14:21 -07:00
devinet.c	ipv4: fail early when creating netdev named all or default	2014-07-29 11:43:50 -07:00
esp4.c	…
fib_frontend.c	ipv4: Restore accept_local behaviour in fib_validate_source()	2014-08-22 12:23:10 -07:00
fib_lookup.h	…
fib_rules.c	…
fib_semantics.c	…
fib_trie.c	list: fix order of arguments for hlist_add_after(_rcu)	2014-08-06 18:01:24 -07:00
gre_demux.c	GRE: enable offloads for GRE	2014-07-11 13:53:39 -07:00
gre_offload.c	net/ipv4: Use IS_ERR_OR_NULL	2014-07-29 15:31:56 -07:00
icmp.c	ipv4: remove nested rcu_read_lock/unlock	2014-08-02 15:27:35 -07:00
igmp.c	net/ipv4/igmp.c: Replace rcu_dereference() with rcu_access_pointer()	2014-08-22 12:23:10 -07:00
inet_connection_sock.c	…
inet_diag.c	…
inet_fragment.c	inet: frags: use kmem_cache for inet_frag_queue	2014-08-02 15:31:31 -07:00
inet_hashtables.c	…
inet_lro.c	…
inet_timewait_sock.c	…
inetpeer.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2014-06-12 14:27:40 -07:00
ip_forward.c	…
ip_fragment.c	inet: frags: use kmem_cache for inet_frag_queue	2014-08-02 15:31:31 -07:00
ip_gre.c	…
ip_input.c	…
ip_options.c	ipv4: fix buffer overflow in ip_options_compile()	2014-07-21 20:16:26 -07:00
ip_output.c	net-timestamp: add key to disambiguate concurrent datagrams	2014-08-05 16:35:54 -07:00
ip_sockglue.c	ipv4: clean up cast warning in do_ip_getsockopt	2014-07-29 16:31:16 -07:00
ip_tunnel.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2014-08-05 18:46:26 -07:00
ip_tunnel_core.c	…
ip_vti.c	vti: Simplify error handling in module init and exit	2014-06-26 08:21:57 +02:00
ipcomp.c	…
ipconfig.c	ipconfig: Use time_before	2014-08-22 12:23:11 -07:00
ipip.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2014-06-11 16:02:55 -07:00
ipmr.c	net: set name_assign_type in alloc_netdev()	2014-07-15 16:12:48 -07:00
netfilter.c	…
ping.c	net: use inet6_iif instead of IP6CB()->iif	2014-07-31 22:37:06 -07:00
proc.c	inet: frag: don't account number of fragment queues	2014-07-27 22:34:36 -07:00
protocol.c	…
raw.c	ipv4: Make IP_MULTICAST_ALL and IP_MSFILTER work on raw sockets	2014-07-23 15:13:26 -07:00
route.c	ipv4: removed redundant conditional	2014-08-08 10:22:22 -07:00
syncookies.c	tcp: cookie_v4_init_sequence: skb should be const	2014-06-27 15:53:35 -07:00
sysctl_net_ipv4.c	…
tcp.c	tcp: don't use timestamp from repaired skb-s to calculate RTT (v2)	2014-08-14 14:38:54 -07:00
tcp_bic.c	…
tcp_cong.c	…
tcp_cubic.c	…
tcp_diag.c	…
tcp_fastopen.c	tcp: remove unnecessary tcp_sk assignment.	2014-06-16 21:35:00 -07:00
tcp_highspeed.c	…
tcp_htcp.c	…
tcp_hybla.c	…
tcp_illinois.c	…
tcp_input.c	tcp: improve undo on timeout	2014-08-22 21:28:02 -07:00
tcp_ipv4.c	tcp: fix tcp_release_cb() to dispatch via address family for mtu_reduced()	2014-08-14 14:38:54 -07:00
tcp_lp.c	…
tcp_memcontrol.c	cgroup: replace cgroup_add_cftypes() with cgroup_add_legacy_cftypes()	2014-07-15 11:05:09 -04:00
tcp_metrics.c	tcp: don't allow syn packets without timestamps to pass tcp_tw_recycle logic	2014-08-14 14:38:54 -07:00
tcp_minisocks.c	inet: move ipv6only in sock_common	2014-07-01 23:46:21 -07:00
tcp_offload.c	net-timestamp: cumulative tcp timestamping fixes	2014-08-06 14:09:01 -07:00
tcp_output.c	tcp: fix tcp_release_cb() to dispatch via address family for mtu_reduced()	2014-08-14 14:38:54 -07:00
tcp_probe.c	…
tcp_scalable.c	…
tcp_timer.c	tcp: reduce spurious retransmits due to transient SACK reneging	2014-08-05 16:29:33 -07:00
tcp_vegas.c	tcp: Fix integer-overflow in TCP vegas	2014-07-30 17:31:06 -07:00
tcp_vegas.h	…
tcp_veno.c	tcp: Fix integer-overflows in TCP veno	2014-07-30 17:31:06 -07:00
tcp_westwood.c	…
tcp_yeah.c	…
tunnel4.c	…
udp.c	sock: remove skb argument from sk_rcvqueues_full	2014-07-23 13:23:06 -07:00
udp_diag.c	…
udp_impl.h	…
udp_offload.c	net/udp_offload: Use IS_ERR_OR_NULL	2014-07-29 15:31:56 -07:00
udp_tunnel.c	udp: Add udp_sock_create for UDP tunnels to open listener socket	2014-07-14 16:12:15 -07:00
udplite.c	…
xfrm4_input.c	…
xfrm4_mode_beet.c	…
xfrm4_mode_transport.c	…
xfrm4_mode_tunnel.c	…
xfrm4_output.c	…
xfrm4_policy.c	…
xfrm4_protocol.c	xfrm4: Remove duplicate semicolon	2014-06-30 07:49:47 +02:00
xfrm4_state.c	…
xfrm4_tunnel.c	…