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SubjectRe: SNB PCI root information
Le 21/06/2012 21:24, Yinghai Lu a écrit :
> On Wed, Jun 20, 2012 at 10:56 PM, Brice Goglin <> wrote:
>>> I suspected that could be other problem. intel system before
>>> sandbridge does not have IIO.
>>> they will have ioh instead, and one ioh would connect to two cpu sockets.
>>> but _PXM for root bus in dsdt only can return one value. Aka it is
>>> acpi spec limitation.
>> The machines I am talking about have two IOHs (one connected to each
>> socket). I only have an old 2.6.27 boot log at hand, I'll ask my admins
>> for more. Do you want the 2.6.27 dmesg anyway?
> log from 2.6.27 should be good enough for this.
> BIOS _PXM return 0 for both pci root buses?

Here's dmesg.
I can't say for sure whether _PXM returns 0 since I don't know how to
read all this :) But Linux puts the first socket cpumap in
/sys/bus/pci/devices/*/local_cpus (and that's wrong according to the
motherboard manual and according to the performance we see).


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