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(parent: 115a046) | patch
ipv4: speedup ip_idents_reserve()
authorEric Dumazet <edumazet@google.com>
Fri, 1 May 2015 17:37:49 +0000 (10:37 -0700)
committerDavid S. Miller <davem@davemloft.net>
Fri, 1 May 2015 23:44:00 +0000 (19:44 -0400)
commit55d7ba86f2c4e40efc2337aa1cb21fcd4e6529b6
treee6a48af10ed15aca0c6d6a34533aef5636714c1ctree | snapshot
parent115a046b3664f58adf11353192b649518172886acommit | diff
ipv4: speedup ip_idents_reserve()

Under stress, ip_idents_reserve() is accessing a contended
cache line twice, with non optimal MESI transactions.

If we place timestamps in separate location, we reduce this
pressure by ~50% and allow atomic_add_return() to issue
a Request for Ownership.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/route.c diff | blob | history
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