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

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Message-ID: <49ABBB21.9080401@trash.net>
Date:	Mon, 02 Mar 2009 11:55:29 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Eric Dumazet <dada1@...mosbay.com>
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

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?
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