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

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Date:	Mon, 02 Mar 2009 23:27:46 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	Patrick McHardy <kaber@...sh.net>,
	David Miller <davem@...emloft.net>,
	Rick Jones <rick.jones2@...com>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH] iptables: lock free counters

Stephen Hemminger a écrit :
> 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.
> 
> 

Yes probably, and on stable versions too, since this problem is quite old...

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