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ipv4: Cache local output routes

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Commit caacf05e5a 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>
This commit is contained in:
Yan, Zheng 2012-08-12 20:09:59 +00:00 committed by David S. Miller
parent aefe5c0060
commit 7bd86cc282
1 changed files with 0 additions and 1 deletions
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net/ipv4/route.c
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@ -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;
}