netdev - [PATCH 0/2 v3] ipv4: Cache dst in tunnels

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Message-ID: <alpine.DEB.2.02.1401021139500.32654@tomh.mtv.corp.google.com>
Date:	Thu, 2 Jan 2014 11:48:18 -0800 (PST)
From:	Tom Herbert <therbert@...gle.com>
To:	davem@...emloft.net, netdev@...r.kernel.org, eric.dumazet@...il.com
Subject: [PATCH 0/2 v3] 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
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