linux-kernel - Re: irq balancing question

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Message-id: <45DEFC91.2050908@shaw.ca>
Date:	Fri, 23 Feb 2007 08:39:13 -0600
From:	Robert Hancock <hancockr@...w.ca>
To:	Imre Gergely <imre.gergely@...ral.ro>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: irq balancing question

Imre Gergely wrote:
> hi
> 
> i have a SMP with 2x duo-core Opteron processors, and i have an ethernet card
> (eth0). i want to balance the interrupts generated by the card to all 4
> processors. i can do this by writing to smp_affinity, but on another machine it
> get's done by "default", without doing anything.
> 
> is this irq balancing a feature in the chipset, or driver, or kernel ? i got
> the idea of the smp_affinity stuff, and i've set it to "f", but nothing
> happens, i mean i see only one CPU getting the interrupts.
> 
> i'm using kernel 2.6.18, but tried with 2.6.19, too.

You need to run the irqbalance daemon to do this, unless the interrupts 
are distributed in hardware (which only some machines do).

-- 
Robert Hancock      Saskatoon, SK, Canada
To email, remove "nospam" from hancockr@...pamshaw.ca
Home Page: http://www.roberthancock.com/

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