From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Mon, 31 May 2010 14:41:35 +0000 (+0200)
Subject: netfilter: xtables: stackptr should be percpu
X-Git-Tag: v2.6.35-rc2~64^2~7^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7489aec8eed4f2f1eb3b4d35763bd3ea30b32ef5;p=pandora-kernel.git

netfilter: xtables: stackptr should be percpu

commit f3c5c1bfd4 (netfilter: xtables: make ip_tables reentrant)
introduced a performance regression, because stackptr array is shared by
all cpus, adding cache line ping pongs. (16 cpus share a 64 bytes cache
line)

Fix this using alloc_percpu()

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-By: Jan Engelhardt <jengelh@medozas.de>
Signed-off-by: Patrick McHardy <kaber@trash.net>
---

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