linux

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History

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
af_decnet.c	net: sk_sleep() helper	2010-04-20 16:37:13 -07:00
dn_dev.c	net: Remove unnecessary returns from void function()s	2010-05-17 23:23:14 -07:00
dn_fib.c
dn_neigh.c	net neigh: RCU conversion of neigh hash table	2010-10-05 14:54:36 -07:00
dn_nsp_in.c	Merge branch 'master' of /repos/git/net-next-2.6	2010-04-20 16:02:01 +02:00
dn_nsp_out.c	net/decnet: Adjust confusing if indentation	2010-08-16 21:06:30 -07:00
dn_route.c	net dst: use a percpu_counter to track entries	2010-10-11 13:06:53 -07:00
dn_rules.c	net: rtnetlink: decouple rtnetlink address families from real address families	2010-04-26 16:13:54 +02:00
dn_table.c
dn_timer.c
Kconfig
Makefile
README
sysctl_net_decnet.c
TODO

README

                       Linux DECnet Project
                      ======================

The documentation for this kernel subsystem is available in the
Documentation/networking subdirectory of this distribution and also
on line at http://www.chygwyn.com/DECnet/

Steve Whitehouse <SteveW@ACM.org>