Messages in this thread | | | Date | Fri, 22 Jun 2012 09:14:06 +0200 | From | Brice Goglin <> | Subject | Re: SNB PCI root information |
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Le 21/06/2012 21:24, Yinghai Lu a écrit : > On Wed, Jun 20, 2012 at 10:56 PM, Brice Goglin <brice.goglin@gmail.com> 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).
Brice
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