netdev - Re: Packet time delays on multi-core systems

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Message-ID: <1285872765.2615.1008.camel@edumazet-laptop>
Date:	Thu, 30 Sep 2010 20:52:45 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexey Vlasov <renton@...ton.name>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: Packet time delays on multi-core systems

Le jeudi 30 septembre 2010 à 22:15 +0400, Alexey Vlasov a écrit :
> On Thu, Sep 30, 2010 at 08:03:02PM +0200, Eric Dumazet wrote:
> > >  
> > > The last test were made already concerning such rx queue binding:
> > > # cat /proc/irq/60/smp_affinity
> > > 001000
> > > # cat /proc/irq/61/smp_affinity
> > > 010000
> > > # cat /proc/irq/62/smp_affinity
> > > 080000
> > > # cat /proc/irq/63/smp_affinity
> > > 800000
> > > 
> > 
> > Why 60, 61, 62, 63 ? This should be 753, 754, 755, 756
> 
> I've got several similar servers, the interrups 60-63 are on
> that one that I can test now, so this isn't a mistake.
> 

If you have a burst of 'LOG' matches, it can really slow down the whole
thing.

You should add a limiter (eg: no more than 5 messages per second)

http://netfilter.org/documentation/HOWTO/packet-filtering-HOWTO-7.html

	This module is most useful after a limit match, so you don't
	flood your logs.



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