Messages in this thread | | | Date | Tue, 26 Feb 2008 15:41:27 -0800 | From | "Yinghai Lu" <> | Subject | Re: [PATCH] x86_64: make amd quad core 8 socket system not be clustered_box v2 |
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On Tue, Feb 26, 2008 at 3:31 PM, Ravikiran Thirumalai <kiran@scalemp.com> wrote: > On Tue, Feb 26, 2008 at 03:16:16PM -0800, Yinghai Lu wrote: > >On Tue, Feb 26, 2008 at 1:24 PM, Ravikiran Thirumalai <kiran@scalemp.com> wrote: > >> > >> On Tue, Feb 26, 2008 at 01:10:57PM -0800, Yinghai Lu wrote: > >> >On Tue, Feb 26, 2008 at 12:32 PM, Ravikiran Thirumalai > >> ><kiran@scalemp.com> wrote: > >> >> On Tue, Feb 26, 2008 at 11:00:58AM -0800, Yinghai Lu wrote: > >> >> > > >> >> >1. if acpi=off ? > >> >> > >> >> Well that is not a realistic scenario for any multi chassi NUMA machine, > >> >> since the proximity information is very important and turning acpi off > >> >> deprives the OS of this information. > >> > > >> >actually OS should detect the distance instead of rely on SLIT. > >> > >> How does it do that? ACPI SRAT is needed to determine this, and it wouldn't > >> work if acpi=off. > > > >srat only have apicid to node mapping, and ram to node mapping. > > Which is very important for performance. > > > > > >for amd64 system, when acpi=off > >ram to node mapping can be retrieved from pci conf space > > I was referring to all types of numa systems, not just AMD. The pci config > space is amd specific. Multi chassi systems in particular would be > acpi SRAT based. Anyways.
can you try x86.git#testing your vsmp to see if is_vsmp_box is working?
http://people.redhat.com/mingo/x86.git/README
YH
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