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4b0b72f7dd
kernel_optimize_test/net/ipv6
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Eric Dumazet 4b0b72f7dd net: speedup udp receive path 
Since commit 95766fff ([UDP]: Add memory accounting.), 
each received packet needs one extra sock_lock()/sock_release() pair.

This added latency because of possible backlog handling. Then later,
ticket spinlocks added yet another latency source in case of DDOS.

This patch introduces lock_sock_bh() and unlock_sock_bh()
synchronization primitives, avoiding one atomic operation and backlog
processing.

skb_free_datagram_locked() uses them instead of full blown
lock_sock()/release_sock(). skb is orphaned inside locked section for
proper socket memory reclaim, and finally freed outside of it.

UDP receive path now take the socket spinlock only once.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-04-28 14:35:48 -07:00
..
netfilter Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-04-11 14:53:53 -07:00
addrconf_core.c ipv6: Remove IPV6_ADDR_RESERVED 2010-02-26 03:59:07 -08:00
addrconf.c net: Fix various endianness glitches 2010-04-20 19:06:52 -07:00
addrlabel.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
af_inet6.c IPv6: Complete IPV6_DONTFRAG support 2010-04-23 23:35:29 -07:00
ah6.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
anycast.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
datagram.c IPv6: Complete IPV6_DONTFRAG support 2010-04-23 23:35:29 -07:00
esp6.c xfrm: SA lookups signature with mark 2010-02-22 16:20:22 -08:00
exthdrs_core.c
exthdrs.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
fib6_rules.c net: rtnetlink: decouple rtnetlink address families from real address families 2010-04-26 16:13:54 +02:00
icmp.c IPv6: Add dontfrag argument to relevant functions 2010-04-23 23:35:28 -07:00
inet6_connection_sock.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-04-27 12:49:13 -07:00
inet6_hashtables.c tcp: Fix a connect() race with timewait sockets 2009-12-08 20:17:51 -08:00
ip6_fib.c net: Fix various endianness glitches 2010-04-20 19:06:52 -07:00
ip6_flowlabel.c IPv6: Add dontfrag argument to relevant functions 2010-04-23 23:35:28 -07:00
ip6_input.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
ip6_output.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-04-27 12:49:13 -07:00
ip6_tunnel.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
ip6mr.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
ipcomp6.c xfrm: SA lookups signature with mark 2010-02-22 16:20:22 -08:00
ipv6_sockglue.c IPv6: Add dontfrag argument to relevant functions 2010-04-23 23:35:28 -07:00
Kconfig IPv6: Fix 6RD typo 2009-10-07 14:50:30 -07:00
Makefile
mcast.c ipv6 mcast: Introduce include/net/mld.h for MLD definitions. 2010-04-23 13:35:55 +09:00
mip6.c ipv6: drop unused "dev" arg of icmpv6_send() 2010-02-18 14:30:17 -08:00
ndisc.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
netfilter.c
proc.c icmp: Account for ICMP out errors 2010-04-03 15:09:04 -07:00
protocol.c
raw.c IPv6: Complete IPV6_DONTFRAG support 2010-04-23 23:35:29 -07:00
reassembly.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
route.c net: ipv6 bind to device issue 2010-04-21 22:59:24 -07:00
sit.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
syncookies.c net: Add rtnetlink init_rcvwnd to set the TCP initial receive window 2009-12-23 14:13:30 -08:00
sysctl_net_ipv6.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
tcp_ipv6.c IPv6: Generic TTL Security Mechanism (final version) 2010-04-22 15:24:53 -07:00
tunnel6.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
udp_impl.h
udp.c net: speedup udp receive path 2010-04-28 14:35:48 -07:00
udplite.c net: spread __net_init, __net_exit 2010-01-17 19:16:02 -08:00
xfrm6_input.c xfrm: SA lookups signature with mark 2010-02-22 16:20:22 -08:00
xfrm6_mode_beet.c
xfrm6_mode_ro.c
xfrm6_mode_transport.c
xfrm6_mode_tunnel.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
xfrm6_output.c ipv6: drop unused "dev" arg of icmpv6_send() 2010-02-18 14:30:17 -08:00
xfrm6_policy.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-04-27 12:49:13 -07:00
xfrm6_state.c
xfrm6_tunnel.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00