From: Cliff Wickman <cpw@sgi.com>
To: Yinghai Lu <yhlu.kernel@gmail.com>
Cc: linux-numa@vger.kernel.org
Subject: Re: Off topic: Numactl "distance" wrong
Date: Fri, 3 Apr 2009 16:05:58 -0500 [thread overview]
Message-ID: <20090403210558.GA14768@sgi.com> (raw)
In-Reply-To: <86802c440904031349v31f84f8anf082db7505e60387@mail.gmail.com>
Hi Yinghai,
On Fri, Apr 03, 2009 at 01:49:27PM -0700, Yinghai Lu wrote:
> On Fri, Apr 3, 2009 at 1:16 PM, Brice Goglin <Brice.Goglin@inria.fr> wrote:
> > Chris Worley wrote:
> >> Sorry for an off topic, but I'm hoping somebody can point me in the
> >> right direction of where to direct this question...
> >>
> >> I have an Opteron system where I've seen the HW diagrams, and each of
> >> 4 sockets is directly connected (HT) to two other sockets, and two HT
> >> hops away from a third (i.e. a simple square topology, no X in the
> >> middle).
> >>
> >> Yet, "numactl --hardware" shows but one hop to each socket:
> >>
> >> # numactl --hardware
> >> ...
> >> node 0 1 2 3
> >> 0: 10 20 20 20
> >> 1: 20 10 20 20
> >> 2: 20 20 10 20
> >> 3: 20 20 20 10
> >>
> >> I know this is wrong.
> >>
> >> Who would be the right person (or list) to talk about this?
Could you try the latest version?
It's available at ftp://oss.sgi.com/www/projects/libnuma/download/
-Cliff
> >>
> >
> > IIRC, the motherboard/BIOS is supposed to report numa distances through
> > the PXM ACPI method. But I have never seen any opteron box do it
> > properly. So you just get 10 for "local" and 20 for "remote". Some
> > Itanium machines however report actual distances.
>
> for x86 64 bit, we are copying SLIT table and save another copy.
>
> could provide one /sys interface to make user could modify it...
>
> YH
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--
Cliff Wickman
Silicon Graphics, Inc.
cpw@sgi.com
(651) 683-3824
parent reply other threads:[~2009-04-03 21:05 UTC|newest]
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[parent not found: <86802c440904031349v31f84f8anf082db7505e60387@mail.gmail.com>]
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