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Eric Dumazet 3b24d854cb tcp/dccp: do not touch listener sk_refcnt under synflood 
When a SYNFLOOD targets a non SO_REUSEPORT listener, multiple
cpus contend on sk->sk_refcnt and sk->sk_wmem_alloc changes.

By letting listeners use SOCK_RCU_FREE infrastructure,
we can relax TCP_LISTEN lookup rules and avoid touching sk_refcnt

Note that we still use SLAB_DESTROY_BY_RCU rules for other sockets,
only listeners are impacted by this change.

Peak performance under SYNFLOOD is increased by ~33% :

On my test machine, I could process 3.2 Mpps instead of 2.4 Mpps

Most consuming functions are now skb_set_owner_w() and sock_wfree()
contending on sk->sk_wmem_alloc when cooking SYNACK and freeing them.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2016-04-04 22:11:20 -04:00
..
ila ila: autoload module 2016-02-21 22:00:28 -05:00
netfilter netfilter: x_tables: enforce nul-terminated table name from getsockopt GET_ENTRIES 2016-03-28 17:59:24 +02:00
Kconfig net: replace dst_cache ip6_tunnel implementation with the generic one 2016-02-16 20:21:48 -05:00
Makefile ila: Create net/ipv6/ila directory 2015-12-15 23:25:20 -05:00
addrconf.c netconf: add macro to represent all attributes 2016-03-13 21:54:44 -04:00
addrconf_core.c
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addrlabel.c ipv6/addrlabel: fix ip6addrlbl_get() 2015-12-22 15:57:54 -05:00
af_inet6.c sock: struct proto hash function may error 2016-02-11 03:54:14 -05:00
ah6.c
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anycast.c
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datagram.c ipv6: process socket-level control messages in IPv6 2016-04-04 15:50:30 -04:00
esp6.c
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exthdrs.c ipv6: add complete rcu protection around np->opt 2015-12-02 23:37:16 -05:00
exthdrs_core.c ipv6: re-enable fragment header matching in ipv6_find_hdr 2016-03-03 16:35:20 -05:00
exthdrs_offload.c
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fib6_rules.c
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icmp.c sock: enable timestamping using control messages 2016-04-04 15:50:30 -04:00
inet6_connection_sock.c soreuseport: fast reuseport TCP socket selection 2016-02-11 03:54:15 -05:00
inet6_hashtables.c tcp/dccp: do not touch listener sk_refcnt under synflood 2016-04-04 22:11:20 -04:00
ip6_checksum.c ipv6: Pass proto to csum_ipv6_magic as __u8 instead of unsigned short 2016-03-13 23:55:13 -04:00
ip6_fib.c ipv6: per netns FIB garbage collection 2016-03-08 15:16:51 -05:00
ip6_flowlabel.c ipv6: process socket-level control messages in IPv6 2016-04-04 15:50:30 -04:00
ip6_gre.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-03-08 12:34:12 -05:00
ip6_icmp.c
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ip6_input.c ipv4: namespacify ip_early_demux sysctl knob 2016-02-16 20:42:54 -05:00
ip6_offload.c tunnels: Don't apply GRO to multiple layers of encapsulation. 2016-03-20 16:33:40 -04:00
ip6_offload.h
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ip6_output.c sock: enable timestamping using control messages 2016-04-04 15:50:30 -04:00
ip6_tunnel.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2016-03-08 12:34:12 -05:00
ip6_udp_tunnel.c ip_tunnel: add support for setting flow label via collect metadata 2016-03-11 15:14:26 -05:00
ip6_vti.c net: replace dst_cache ip6_tunnel implementation with the generic one 2016-02-16 20:21:48 -05:00
ip6mr.c net: ipmr, ip6mr: fix vif/tunnel failure race condition 2015-11-24 17:15:56 -05:00
ipcomp6.c
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ipv6_sockglue.c ipv6: process socket-level control messages in IPv6 2016-04-04 15:50:30 -04:00
mcast.c mld, igmp: Fix reserved tailroom calculation 2016-03-03 15:41:07 -05:00
mcast_snoop.c
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mip6.c
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ndisc.c ipv6: add option to drop unsolicited neighbor advertisements 2016-02-11 04:27:36 -05:00
netfilter.c
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output_core.c
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ping.c sock: enable timestamping using control messages 2016-04-04 15:50:30 -04:00
proc.c
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protocol.c
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raw.c sock: enable timestamping using control messages 2016-04-04 15:50:30 -04:00
reassembly.c net: use skb_postpush_rcsum instead of own implementations 2016-02-19 23:43:10 -05:00
route.c ipv6: enforce flowi6_oif usage in ip6_dst_lookup_tail() 2016-01-29 20:31:26 -08:00
sit.c tunnels: Remove encapsulation offloads on decap. 2016-03-20 16:33:40 -04:00
syncookies.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2016-03-19 10:05:34 -07:00
sysctl_net_ipv6.c
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tcp_ipv6.c tcp/dccp: do not touch listener sk_refcnt under synflood 2016-04-04 22:11:20 -04:00
tcpv6_offload.c
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tunnel6.c ipv6: fix tunnel error handling 2015-11-03 10:52:13 -05:00
udp.c udp: no longer use SLAB_DESTROY_BY_RCU 2016-04-04 22:11:19 -04:00
udp_impl.h
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udp_offload.c GSO: Provide software checksum of tunneled UDP fragmentation offload 2016-02-26 14:23:35 -05:00
udplite.c
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xfrm6_input.c
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xfrm6_mode_beet.c
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xfrm6_mode_ro.c
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xfrm6_mode_transport.c
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xfrm6_mode_tunnel.c ipv6: update skb->csum when CE mark is propagated 2016-01-15 15:07:23 -05:00
xfrm6_output.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-10-24 06:54:12 -07:00
xfrm6_policy.c Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec 2015-12-22 16:26:31 -05:00
xfrm6_protocol.c
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xfrm6_state.c
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xfrm6_tunnel.c
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