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fa76ce7328
linux/net/ipv6
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Eric Dumazet fa76ce7328 inet: get rid of central tcp/dccp listener timer 
One of the major issue for TCP is the SYNACK rtx handling,
done by inet_csk_reqsk_queue_prune(), fired by the keepalive
timer of a TCP_LISTEN socket.

This function runs for awful long times, with socket lock held,
meaning that other cpus needing this lock have to spin for hundred of ms.

SYNACK are sent in huge bursts, likely to cause severe drops anyway.

This model was OK 15 years ago when memory was very tight.

We now can afford to have a timer per request sock.

Timer invocations no longer need to lock the listener,
and can be run from all cpus in parallel.

With following patch increasing somaxconn width to 32 bits,
I tested a listener with more than 4 million active request sockets,
and a steady SYNFLOOD of ~200,000 SYN per second.
Host was sending ~830,000 SYNACK per second.

This is ~100 times more what we could achieve before this patch.

Later, we will get rid of the listener hash and use ehash instead.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-03-20 12:40:25 -04:00
..
netfilter netfilter: fix sparse warnings in reject handling 2015-03-10 15:01:32 +01:00
addrconf_core.c ipv6: remove rt6i_genid 2014-09-30 14:00:48 -04:00
addrconf.c ipv4, ipv6: kill ip_mc_{join, leave}_group and ipv6_sock_mc_{join, drop} 2015-03-18 22:05:09 -04:00
addrlabel.c net: Introduce possible_net_t 2015-03-12 14:39:40 -04:00
af_inet6.c net: use common macro for assering skb->cb[] available size in protocol families 2015-03-02 00:19:30 -05:00
ah6.c ipv6: coding style improvements (remove assignment in if statements) 2014-11-23 21:00:56 -05:00
anycast.c ipv6: remove aca_lock spinlock from struct ifacaddr6 2014-10-14 13:15:15 -04:00
datagram.c ip: fix error queue empty skb handling 2015-03-08 23:01:54 -04:00
esp6.c ipv6: coding style improvements (remove assignment in if statements) 2014-11-23 21:00:56 -05:00
exthdrs_core.c ipv6: ipv6_find_hdr restore prev functionality 2014-02-27 18:27:26 -05:00
exthdrs_offload.c ipv6: Fix exthdrs offload registration. 2014-03-06 16:35:55 -05:00
exthdrs.c net: Convert LIMIT_NETDEBUG to net_dbg_ratelimited 2014-11-11 14:10:31 -05:00
fib6_rules.c ipv6: move IPV6_TCLASS_SHIFT into ipv6.h and define a helper 2014-01-15 15:53:18 -08:00
icmp.c ipv6:icmp:remove unnecessary brackets 2015-01-14 16:35:49 -05:00
inet6_connection_sock.c inet: get rid of central tcp/dccp listener timer 2015-03-20 12:40:25 -04:00
inet6_hashtables.c inet: get rid of last __inet_hash_connect() argument 2015-03-18 22:00:35 -04:00
ip6_checksum.c udp: Generic functions to set checksum 2014-06-04 22:46:38 -07:00
ip6_fib.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-01-27 16:59:56 -08:00
ip6_flowlabel.c net: Kill hold_net release_net 2015-03-12 14:39:40 -04:00
ip6_gre.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-02-05 14:33:28 -08:00
ip6_icmp.c ipv6: White-space cleansing : Line Layouts 2014-08-24 22:37:52 -07:00
ip6_input.c ipv6: coding style improvements (remove assignment in if statements) 2014-11-23 21:00:56 -05:00
ip6_offload.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-11-29 20:47:48 -08:00
ip6_offload.h ipv6: Pull IPv6 GSO registration out of the module 2012-11-15 17:39:24 -05:00
ip6_output.c udp: only allow UFO for packets from SOCK_DGRAM sockets 2015-03-02 22:19:29 -05:00
ip6_tunnel.c ipv6: remove dead debug code from ip6_tunnel.c 2015-02-24 16:25:25 -05:00
ip6_udp_tunnel.c udp: Do not require sock in udp_tunnel_xmit_skb 2015-01-24 23:15:40 -08:00
ip6_vti.c tunnels: advertise link netns via netlink 2015-01-19 14:32:03 -05:00
ip6mr.c net: Introduce possible_net_t 2015-03-12 14:39:40 -04:00
ipcomp6.c ipv6: White-space cleansing : Structure layouts 2014-08-24 22:37:52 -07:00
ipv6_sockglue.c ipv4, ipv6: kill ip_mc_{join, leave}_group and ipv6_sock_mc_{join, drop} 2015-03-18 22:05:09 -04:00
Kconfig ip6_vti: Fix build when NET_IP_TUNNEL is not set. 2014-02-20 14:29:49 +01:00
Makefile udp_tunnel: Only build ip6_udp_tunnel.c when IPV6 is selected 2014-09-19 22:05:28 -04:00
mcast.c ipv4, ipv6: kill ip_mc_{join, leave}_group and ipv6_sock_mc_{join, drop} 2015-03-18 22:05:09 -04:00
mip6.c net: Convert LIMIT_NETDEBUG to net_dbg_ratelimited 2014-11-11 14:10:31 -05:00
ndisc.c neigh: Factor out ___neigh_lookup_noref 2015-03-04 00:23:23 -05:00
netfilter.c net: Convert LIMIT_NETDEBUG to net_dbg_ratelimited 2014-11-11 14:10:31 -05:00
output_core.c ipv6: Make __ipv6_select_ident static 2015-02-09 14:21:03 -08:00
ping.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-03-09 23:38:02 -04:00
proc.c udp: Increment UDP_MIB_IGNOREDMULTI for arriving unmatched multicasts 2014-11-07 15:45:50 -05:00
protocol.c net: Export inet_offloads and inet6_offloads 2014-09-19 17:15:31 -04:00
raw.c net: Remove iocb argument from sendmsg and recvmsg 2015-03-02 13:06:31 -05:00
reassembly.c ipv6: coding style improvements (remove assignment in if statements) 2014-11-23 21:00:56 -05:00
route.c ipv6: expose RFC4191 route preference via rtnetlink 2015-03-11 23:28:09 -04:00
sit.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-02-05 14:33:28 -08:00
syncookies.c inet: get rid of central tcp/dccp listener timer 2015-03-20 12:40:25 -04:00
sysctl_net_ipv6.c ipv6: add sysctl_mld_qrv to configure query robustness variable 2014-09-04 22:26:14 -07:00
tcp_ipv6.c inet: get rid of central tcp/dccp listener timer 2015-03-20 12:40:25 -04:00
tcpv6_offload.c tcp: cleanup static functions 2015-02-28 16:56:51 -05:00
tunnel6.c ipv6: White-space cleansing : gaps between function and symbol export 2014-08-24 22:37:52 -07:00
udp_impl.h net: Remove iocb argument from sendmsg and recvmsg 2015-03-02 13:06:31 -05:00
udp_offload.c udp: Set SKB_GSO_UDP_TUNNEL* in UDP GRO path 2015-02-11 15:12:10 -08:00
udp.c netns: constify net_hash_mix() and various callers 2015-03-18 22:00:34 -04:00
udplite.c net: Eliminate no_check from protosw 2014-05-23 16:28:53 -04:00
xfrm6_input.c ipv6: White-space cleansing : gaps between function and symbol export 2014-08-24 22:37:52 -07:00
xfrm6_mode_beet.c ipsec: be careful of non existing mac headers 2012-02-23 16:50:45 -05:00
xfrm6_mode_ro.c ipv4/ipv6: Fix FSF address in file headers 2013-12-06 12:37:56 -05:00
xfrm6_mode_transport.c
xfrm6_mode_tunnel.c xfrm6: Remove xfrm_tunnel_notifier 2014-03-14 07:28:08 +01:00
xfrm6_output.c ipv6: White-space cleansing : gaps between function and symbol export 2014-08-24 22:37:52 -07:00
xfrm6_policy.c net: Remove protocol from struct dst_ops 2015-03-09 16:06:10 -04:00
xfrm6_protocol.c xfrm6: Properly handle unsupported protocols 2014-05-06 07:08:38 +02:00
xfrm6_state.c ipv6: White-space cleansing : Line Layouts 2014-08-24 22:37:52 -07:00
xfrm6_tunnel.c ipv6: White-space cleansing : gaps between function and symbol export 2014-08-24 22:37:52 -07:00