]> git.baikalelectronics.ru Git - kernel.git/commit
ipv4: Cache local output routes
authorYan, Zheng <zheng.z.yan@intel.com>
Sun, 12 Aug 2012 20:09:59 +0000 (20:09 +0000)
committerDavid S. Miller <davem@davemloft.net>
Tue, 14 Aug 2012 21:45:07 +0000 (14:45 -0700)
commit5b109439b3c70904d6cdb979c587cf3c4877a12b
tree3d40c40d31d9556c095a9e50d54528886fdbcc79
parent6cb5ec79716280c4cd37d7fda8f2d3917aeffbaa
ipv4: Cache local output routes

Commit f3166a58ed0ff63 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>
net/ipv4/route.c