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

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Date:	Mon, 02 Mar 2009 18:47:09 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Patrick McHardy <kaber@...sh.net>
CC:	Stephen Hemminger <shemminger@...tta.com>,
	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

Patrick McHardy a écrit :
> Eric Dumazet wrote:
>> # time iptables -nvL
>> Chain INPUT (policy ACCEPT 416M packets, 64G bytes)
>>  pkts bytes target     prot opt in     out     source              
>> destination
>>
>> Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
>>  pkts bytes target     prot opt in     out     source              
>> destination
>>
>> Chain OUTPUT (policy ACCEPT 401M packets, 62G bytes)
>>  pkts bytes target     prot opt in     out     source              
>> destination
>>
>> 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 :)

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