Merge branch 'tunnel_dst_caching'

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Tom Herbert says:

====================
ipv4: Cache dst in tunnels

Version 3 of caching routes in tunnels.

Addressed some comments from Eric in this series.

There are two patches (variants) in the series:
1) One dst cached for each tunnel.
2) Percpu dst cache per tunnel to avoid false sharing

Testing with GRE tunnels on a 32 CPU host with bnx2x (RSS support
for GRE) shows a modest improvement in CPU utilization with these
patches running 200 TCP_RR netperf clients.

Without patches
71.22% CPU utilization
138/180/244 90/95/99% latencies
1.30465e+06 CPU/tps
18318 CPU/tps

With patches
69.84%
142/186/249 90/95/99% latencies
1.30827e+06
18732 CPU/tps
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

David S. Miller 2014-01-03 19:41:39 -05:00

parent f916ec9608 9a4aa9af44

commit e9bf3b0753

2 changed files with 116 additions and 24 deletions

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7

include/net/ip_tunnels.h

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133

net/ipv4/ip_tunnel.c

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