From: Eric Dumazet Date: Thu, 14 Oct 2010 20:56:39 +0000 (+0000) Subject: fib_hash: RCU conversion phase 2 X-Git-Tag: v2.6.37-rc1~147^2~118 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=19f572565ef66a0439574fd2299a7c804147e133;p=pandora-kernel.git fib_hash: RCU conversion phase 2 Get rid of fib_hash_lock rwlock. The fn_zone hash table resize is the noticeable part of this patch. I added a seqlock per fn_zone, so that readers can restart their lookup in the (very rare) case a writer expanded the hash table. Add rcu heads in fib_alias and fib_node, use call_rcu() to defer their freeing, and use appropriate _rcu list manipulations. Stress test (160.000.000 udp frames sent, IP route cache disabled to mimic DDOS attack, FIB_HASH) Before: real 0m41.191s user 0m13.137s sys 8m55.241s After: real 0m38.091s user 0m13.189s sys 7m53.018s Signed-off-by: Eric Dumazet Signed-off-by: David S. Miller --- Reading git-diff-tree failed