linux-kernel - Re: [2.6.36.1] IGB driver handles all ethX interrupts on single cpu core.

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Message-ID: <4CFEE2F9.90600@gmail.com>
Date:	Tue, 07 Dec 2010 19:44:25 -0600
From:	Robert Hancock <hancockrwd@...il.com>
To:	Paweł Sikora <pluto@...k.net>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [2.6.36.1] IGB driver handles all ethX interrupts on single cpu
 core.

On 12/07/2010 12:06 PM, Paweł Sikora wrote:
> hi,
>
> i'm currently testing a new server with 2x opteron-6128 with dual gigabit port
> and observing that the igb driver uses only single core for all ethX interrupts.
> is it a correct behaviour for this driver?
>
> BR,
> Pawel.

The CPU affinity for the IRQ isn't really under the driver's control. It 
looks like all your interrupts are being handled on CPU0. You likely 
need to run the irqbalance daemon.
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