netdev - Re: dynticks + iptables almost stops the boot process [was: Re: 2.6.20-rc6-mm3]

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Date:	Wed, 07 Feb 2007 00:12:23 +0100
From:	Tilman Schmidt <tilman@...p.cc>
To:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	mingo@...hat.com, netdev@...r.kernel.org,
	netfilter-devel@...ts.netfilter.org
Subject: Re: dynticks + iptables almost stops the boot process [was: Re: 2.6.20-rc6-mm3]

Am 06.02.2007 20:28 schrieb Mattia Dongili:
> On Tue, Feb 06, 2007 at 05:48:26PM +0100, Ingo Molnar wrote:
>> Could you try the patch below? The RCU serialization code (a rare call 
>> but can be common in some types of setups) has a nasty implicit 
>> dependency on the HZ tick - which until now was a hidden wart but became 
>> an explicit bug under dynticks. Maybe this is what is slowing down your 
>> box.

I have the same problem (huge delay when loading iptables) with
2.6.20-rc6-mm3, and for me this patch did fix it.

> No, not this. Anyway the last patch Thomas forwarded does fix the
> problem.

Which one would that be? I might try it for comparison.

Thanks,
Tilman

-- 
Tilman Schmidt                          E-Mail: tilman@...p.cc
Bonn, Germany
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