netdev - Re: iptables very slow after commit784544739a25c30637397ace5489eeb6e15d7d49

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Message-Id: <20090410.182507.140306636.davem@davemloft.net>
Date:	Fri, 10 Apr 2009 18:25:07 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	shemminger@...tta.com
Cc:	jeff.chua.linux@...il.com, dada1@...mosbay.com, jengelh@...ozas.de,
	kaber@...sh.net, r000n@...0n.net, torvalds@...ux-foundation.org,
	linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: iptables very slow after
 commit784544739a25c30637397ace5489eeb6e15d7d49

From: Stephen Hemminger <shemminger@...tta.com>
Date: Fri, 10 Apr 2009 09:52:46 -0700

[ CC:'ing netfilter-devel and netdev... ]

> On Fri, 10 Apr 2009 17:15:52 +0800 (SGT)
> Jeff Chua <jeff.chua.linux@...il.com> wrote:
> 
>> 
>> 
>> Adding 200 records in iptables took 6.0sec in 2.6.30-rc1 compared to 
>> 0.2sec in 2.6.29. I've bisected down this commit.
>> 
>> There are a few patches on top of the original patch. When I reverted the 
>> original commit + changing rcu_read() to rcu_read_bh(), it speeds up the 
>> inserts back to .2sec again.
>> 
>> I'm loading all the firewall rules during boot-up and this 6 secs slowness 
>> is really not very nice to wait for.
> 
> The performance benefit during operation is more important. The load
> time is fixable. The problem is probably generic to any set of rules,
> but could you post some info about your configuration (like the rule
> set), and the system configuration (# of cpu's, config etc).
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