netdev - Re: bnx2/5709: Strange interrupts spread

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Message-ID: <1279568875.2458.0.camel@edumazet-laptop>
Date:	Mon, 19 Jul 2010 21:47:55 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Michael Chan <mchan@...adcom.com>
Cc:	Christophe Ngo Van Duc <cngovanduc@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: bnx2/5709: Strange interrupts spread

Le lundi 19 juillet 2010 à 11:47 -0700, Michael Chan a écrit :
> On Mon, 2010-07-19 at 08:55 -0700, Christophe Ngo Van Duc wrote:
> > So i've been able to do some test today:
> > If I put the 2 interface in a bridge with no IP adress, the interrupts
> > are on 1 CPU
> > If I put the 2 interface in a bridge with IP adress, the interrupts
> > are still on 1 CPU
> > If I put the 2 interface outside the bridge with IP address,
> > everything works fine the interrupts get spread on the CPU
> > 
> > So the conclusion seems to be that when the bnx2 is put into
> > promiscuous mode by the bridge, the RSS hash stop to work even if
> > traffic is IP in nature.
> 
> I did a quick test with bridging and saw no problem with RSS.  I did see
> this though:
> 
> br0 received packet on queue 4, but number of RX queues is 1
> 
> Looks like it is a warning message from RPS.
> 

Christophe uses an old kernel, not RPS enabled ;)



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