linux-kernel - Re: irq balancing question

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Message-Id: <1172257289.3241.48.camel@laptopd505.fenrus.org>
Date:	Fri, 23 Feb 2007 20:01:29 +0100
From:	Arjan van de Ven <arjan@...radead.org>
To:	Gergely Imre <imre.gergely@...ral.ro>
Cc:	linux-kernel@...r.kernel.org, hancockr@...w.ca
Subject: Re: irq balancing question


> 
> and i guess it doesn't matter if the distribution is being done by the
> hardware, from the point of view of the kernel, i would still get the
> performance penalty.

for the cache bouncing you save assuming you have an Intel cpu (eg one
where the cache is shared). You don't save on the cross-cpu reassembly,
that is an entire different algorithm path you hit there..



> i'm just trying to figure it out, i have no real knowledge of the inner
> kernel workings, so i dont know. but i really would like to use all 4 cores.
> just how expensive is that reassembly path ?

depends on your traffic to be honest, probably a question more suited
for net-dev list.

-- 
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