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From: Arjan van de Ven <>
To: Imre Gergely <>
Subject: Re: irq balancing question
Date: Fri, 23 Feb 2007 15:45:17 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Fri, 2007-02-23 at 13:32 +0200, 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. 

you have only one card? then balancing like you say will only really
hurt you; neither linux nor the chipset will do this.

> 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.

if you have multiple real interrupt sources you can balance between them
using irqbalance, see
But note that this program will NOT move one irq across 4 cpus all the
time, since that gives *really* bad performance.

if you want to mail me at work (you don't), use arjan (at)
Test the interaction between Linux and your BIOS via

  reply	other threads:[~2007-02-23 14:45 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-23 11:32 Imre Gergely
2007-02-23 14:45 ` Arjan van de Ven [this message]
2007-02-23 14:58   ` Gergely Imre
2007-02-23 15:54     ` Arjan van de Ven
2007-02-23 18:51       ` Gergely Imre
2007-02-23 19:01         ` Arjan van de Ven
2007-02-23 20:57           ` Gergely Imre
     [not found] <fa.o8VX4Uax4/>
2007-02-23 14:39 ` Robert Hancock
  -- strict thread matches above, loose matches on Subject: below --
2005-12-15 14:00 Pallipadi, Venkatesh
2005-11-17  8:28 ` JaniD++
2005-12-15  0:48 Pallipadi, Venkatesh
2005-12-15  9:10 ` JaniD++
2005-12-14 21:05 JaniD++
2005-12-14 21:16 ` Arjan van de Ven
2005-12-14 21:31   ` JaniD++

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