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linux/net/ipv6
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Eric Dumazet fc66f95c68 net dst: use a percpu_counter to track entries 
struct dst_ops tracks number of allocated dst in an atomic_t field,
subject to high cache line contention in stress workload.

Switch to a percpu_counter, to reduce number of time we need to dirty a
central location. Place it on a separate cache line to avoid dirtying
read only fields.

Stress test :

(Sending 160.000.000 UDP frames,
IP route cache disabled, dual E5540 @2.53GHz,
32bit kernel, FIB_TRIE, SLUB/NUMA)

Before:

real    0m51.179s
user    0m15.329s
sys     10m15.942s

After:

real	0m45.570s
user	0m15.525s
sys	9m56.669s

With a small reordering of struct neighbour fields, subject of a
following patch, (to separate refcnt from other read mostly fields)

real	0m41.841s
user	0m15.261s
sys	8m45.949s

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-10-11 13:06:53 -07:00
..
netfilter net: return operator cleanup 2010-09-23 14:33:39 -07:00
addrconf_core.c ipv6: Remove IPV6_ADDR_RESERVED 2010-02-26 03:59:07 -08:00
addrconf.c ipv6: make __ipv6_isatap_ifid static 2010-10-05 00:47:39 -07:00
addrlabel.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-09-27 01:03:03 -07:00
af_inet6.c net: return operator cleanup 2010-09-23 14:33:39 -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 net-next: remove useless union keyword 2010-06-10 23:31:35 -07:00
datagram.c udp: add rehash on connect() 2010-09-08 21:45:01 -07:00
esp6.c xfrm: SA lookups signature with mark 2010-02-22 16:20:22 -08:00
exthdrs_core.c net: return operator cleanup 2010-09-23 14:33:39 -07:00
exthdrs.c ipv6: avoid two atomics in ipv6_rthdr_rcv() 2010-06-14 23:13:06 -07:00
fib6_rules.c net-next: remove useless union keyword 2010-06-10 23:31:35 -07:00
icmp.c ipv6: fix ICMP6_MIB_OUTERRORS 2010-06-09 18:39:27 -07:00
inet6_connection_sock.c ipv6: Refactor update of IPv6 flowi destination address for srcrt (RH) option 2010-06-02 07:08:31 -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-next: remove useless union keyword 2010-06-10 23:31:35 -07:00
ip6_flowlabel.c IPv6: Add dontfrag argument to relevant functions 2010-04-23 23:35:28 -07:00
ip6_input.c Merge branch 'master' of /repos/git/net-next-2.6 2010-04-20 16:02:01 +02:00
ip6_output.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-09-27 01:03:03 -07:00
ip6_tunnel.c net: add a core netdev->rx_dropped counter 2010-10-05 14:47:55 -07:00
ip6mr.c net: add a core netdev->rx_dropped counter 2010-10-05 14:47:55 -07:00
ipcomp6.c xfrm: SA lookups signature with mark 2010-02-22 16:20:22 -08:00
ipv6_sockglue.c ipv6: remove ipv6_statistics 2010-06-25 21:33:17 -07:00
Kconfig ipv6: ip6mr: support multiple tables 2010-05-11 14:40:55 +02:00
Makefile
mcast.c net-next: remove useless union keyword 2010-06-10 23:31:35 -07:00
mip6.c IPv6: fix CoA check in RH2 input handler (mip6_rthdr_input()) 2010-07-18 15:04:33 -07:00
ndisc.c net neigh: RCU conversion of neigh hash table 2010-10-05 14:54:36 -07:00
netfilter.c netfilter: kill redundant check code in which setting ip_summed value 2010-06-14 16:20:02 +02:00
proc.c snmp: 64bit ipstats_mib for all arches 2010-06-30 13:31:19 -07:00
protocol.c net: inet_add_protocol() can use cmpxchg() 2010-09-08 21:31:35 -07:00
raw.c net: return operator cleanup 2010-09-23 14:33:39 -07:00
reassembly.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-09-09 22:27:33 -07:00
route.c net dst: use a percpu_counter to track entries 2010-10-11 13:06:53 -07:00
sit.c net: add a core netdev->rx_dropped counter 2010-10-05 14:47:55 -07:00
syncookies.c syncookies: add support for ECN 2010-06-26 22:00:03 -07:00
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 net: return operator cleanup 2010-09-23 14:33:39 -07:00
tunnel6.c tunnels: missing rcu_assign_pointer() 2010-09-09 15:02:39 -07:00
udp_impl.h net: Make setsockopt() optlen be unsigned. 2009-09-30 16:12:20 -07:00
udp.c udp: add rehash on connect() 2010-09-08 21:45:01 -07:00
udplite.c net: spread __net_init, __net_exit 2010-01-17 19:16:02 -08:00
xfrm6_input.c netfilter: ipv6: use NFPROTO values for NF_HOOK invocation 2010-03-25 16:00:49 +01:00
xfrm6_mode_beet.c ipsec: Interfamily IPSec BEET, ipv4-inner ipv6-outer 2008-08-06 02:40:25 -07:00
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 netfilter: ipv6: use NFPROTO values for NF_HOOK invocation 2010-03-25 16:00:49 +01:00
xfrm6_policy.c net dst: use a percpu_counter to track entries 2010-10-11 13:06:53 -07:00
xfrm6_state.c xfrm: Allow different selector family in temporary state 2010-09-20 11:11:38 -07:00
xfrm6_tunnel.c ipv6: struct xfrm6_tunnel in read_mostly section 2010-08-30 13:50:46 -07:00