From: Matthew Wilcox <matthew@wil.cx>
To: Grant Grundler <grundler@parisc-linux.org>
Cc: linux-pci@vger.kernel.org, jbarnes@virtuousgeek.org,
linux-kernel@vger.kernel.org,
Matthew Wilcox <willy@linux.intel.com>
Subject: Re: [PATCH 1/6] Rewrite MSI-HOWTO
Date: Mon, 2 Mar 2009 14:01:52 -0700 [thread overview]
Message-ID: <20090302210152.GA725@parisc-linux.org> (raw)
In-Reply-To: <20090302203340.GA9302@colo.lackof.org>
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."
next prev parent reply other threads:[~2009-03-02 21:02 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-23 17:27 Support for multiple MSI Matthew Wilcox
2009-02-23 17:27 ` [PATCH 1/6] Rewrite MSI-HOWTO Matthew Wilcox
2009-02-24 20:00 ` Randy Dunlap
2009-02-24 20:28 ` Matthew Wilcox
2009-02-24 20:55 ` Randy Dunlap
2009-02-25 7:34 ` Sitsofe Wheeler
2009-02-27 6:15 ` Grant Grundler
2009-02-27 12:14 ` Matthew Wilcox
2009-03-01 23:46 ` Michael Ellerman
2009-03-02 20:33 ` Grant Grundler
2009-03-02 21:01 ` Matthew Wilcox [this message]
2009-02-23 17:27 ` [PATCH 2/6] PCI MSI: Replace 'type' with 'is_msix' Matthew Wilcox
2009-03-03 0:16 ` Michael Ellerman
2009-02-23 17:27 ` [PATCH 3/6] PCI MSI: msi_desc->dev is always initialised Matthew Wilcox
2009-02-23 17:28 ` [PATCH 4/6] PCI MSI: Use mask_pos instead of mask_base when appropriate Matthew Wilcox
2009-02-23 17:28 ` [PATCH 5/6] PCI MSI: Refactor interrupt masking code Matthew Wilcox
2009-03-03 0:16 ` Michael Ellerman
2009-03-16 21:01 ` Matthew Wilcox
2009-02-23 17:28 ` [PATCH 6/6] PCI MSI: Add support for multiple MSI Matthew Wilcox
2009-03-03 0:16 ` Michael Ellerman
2009-03-16 21:07 ` Matthew Wilcox
2009-03-04 14:52 ` Support " Eric W. Biederman
2009-03-04 22:26 ` Matthew Wilcox
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