linux-kernel - Re: [PATCH 1/6] Rewrite MSI-HOWTO

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Message-ID: <20090302210152.GA725@parisc-linux.org>
Date:	Mon, 2 Mar 2009 14:01:52 -0700
From:	Matthew Wilcox <matthew@....cx>
To:	Grant Grundler <grundler@...isc-linux.org>
Cc:	linux-pci@...r.kernel.org, jbarnes@...tuousgeek.org,
	linux-kernel@...r.kernel.org,
	Matthew Wilcox <willy@...ux.intel.com>
Subject: Re: [PATCH 1/6] Rewrite MSI-HOWTO

On Mon, Mar 02, 2009 at 01:33:40PM -0700, Grant Grundler wrote:
> AFAICT "round-robin" was a behavior of older kernels.
> All the x86 platforms I've looked at direct the MSI to exactly
> one CPU.

I think it's a factor of your chipset.  For example, my laptop:

$ grep MSI /proc/interrupts 
 26:      33095      33046   PCI-MSI-edge      eth0
 27:     127014     126190   PCI-MSI-edge      ahci
 28:          0          0   PCI-MSI-edge      ahci
 29:          0          0   PCI-MSI-edge      ahci
 31:     525988     518310   PCI-MSI-edge      iwlagn

I know my G33-based desktop also distributes interrupts equally across
all four cores.  It is, of course, possibly to manually set the
affinity, and perhaps that's what you're seeing.

> > Did you see this is patch 1/6?  ;-)
> 
> yes....after I hit send and continued reviewing the rest of the patches. ;)

It's good to know somebody looked at patches 2-6 because I've not had
any comments yet.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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