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authorYan, Zheng <zheng.z.yan@intel.com>2012-08-12 20:09:59 +0000
committerDavid S. Miller <davem@davemloft.net>2012-08-14 14:45:07 -0700
commit7bd86cc282a458b66c41e3f6676de6656c99b8db (patch)
tree3d40c40d31d9556c095a9e50d54528886fdbcc79
parentaefe5c0060639914cce7ed4947f2c030f615bebf (diff)
ipv4: Cache local output routes
Commit caacf05e5ad1abf causes big drop of UDP loop back performance. The cause of the regression is that we do not cache the local output routes. Each time we send a datagram from unconnected UDP socket, the kernel allocates a dst_entry and adds it to the rt_uncached_list. It creates lock contention on the rt_uncached_lock. Reported-by: Alex Shi <alex.shi@intel.com> Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/ipv4/route.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index e4ba974f143c..fd9ecb52c66b 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -2028,7 +2028,6 @@ struct rtable *__ip_route_output_key(struct net *net, struct flowi4 *fl4)
}
dev_out = net->loopback_dev;
fl4->flowi4_oif = dev_out->ifindex;
- res.fi = NULL;
flags |= RTCF_LOCAL;
goto make_route;
}

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