netdev - Re: [PATCH] iptables: lock free counters

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Message-ID: <20090302221730.GJ6712@linux.vnet.ibm.com>
Date:	Mon, 2 Mar 2009 14:17:30 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	Eric Dumazet <dada1@...mosbay.com>,
	David Miller <davem@...emloft.net>,
	Rick Jones <rick.jones2@...com>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: [PATCH] iptables: lock free counters

On Mon, Mar 02, 2009 at 11:07:18PM +0100, Patrick McHardy wrote:
> Stephen Hemminger wrote:
>> On Mon, 02 Mar 2009 22:56:39 +0100
>> Patrick McHardy <kaber@...sh.net> wrote:
>>> Eric Dumazet wrote:
>>>> Patrick McHardy a écrit :
>>>>> Eric Dumazet wrote:
>>>>>> real    0m1.810s
>>>>>> user    0m0.000s
>>>>>> sys     0m0.001s
>>>>> Thats really slow ...
>>>>>
>>>>>> CONFIG_NO_HZ=y
>>>>>> CONFIG_HZ_1000=y
>>>>>> CONFIG_HZ=1000
>>>>>>
>>>>>> One cpu is 100% handling softirqs, could it be the problem ?
>>>>> Is this fixed by your RCU quiescent state fix?
>>>> Yes it is :)
>>> Great, thanks :)
>> I wonder if the RCU quiescent fix should go in 2.6.29 because it
>> fixes other issues like route changing RCU latency under Dos attack.
>
> From what I can tell, it should.

I agree.

							Thanx, Paul
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