netdev - Re: Network card IRQ balancing with Intel 5000 series chipsets

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Message-Id: <1167170793.3281.3209.camel@laptopd505.fenrus.org>
Date:	Tue, 26 Dec 2006 23:06:33 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	hadi@...erus.ca
Cc:	Robert Iakobashvili <coroberti@...il.com>, netdev@...r.kernel.org
Subject: Re: Network card IRQ balancing with Intel 5000 series chipsets

On Tue, 2006-12-26 at 13:44 -0500, jamal wrote:
> If you compile in PCI-E support you should have more control of the
> MSI-X, no? I would tie the MSI to a specific processor statically; my
> past experiences with any form of interupt balancing with network loads
> has been horrible.


it is; that's why irqbalance tries really hard (with a few very rare
exceptions) to keep networking irqs to the same cpu all the time...

but if your use case is kernel level packet processing of < MTU packets
then I can see why you would at some point would run out of cpu
power ... esp on multicore where you share the cache between cores you
probably can do a little better for that very specific use case.

-- 
if you want to mail me at work (you don't), use arjan (at) linux.intel.com
Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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