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

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Message-ID: <20090302140243.3aad4d5b@nehalam>
Date:	Mon, 2 Mar 2009 14:02:43 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	Eric Dumazet <dada1@...mosbay.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

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.
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