lkml.org 
[lkml]   [2009]   [Apr]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: Off topic: Numactl "distance" wrong
    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?

    numactl and libnuma are discussed on
    linux-numa@vger.kernel.org

    > >>
    > >
    > > 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
    > --
    > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    > the body of a message to majordomo@vger.kernel.org
    > More majordomo info at http://vger.kernel.org/majordomo-info.html
    > Please read the FAQ at http://www.tux.org/lkml/

    --
    Cliff Wickman
    Silicon Graphics, Inc.
    cpw@sgi.com
    (651) 683-3824


    \
     
     \ /
      Last update: 2009-04-03 23:03    [W:0.024 / U:3.752 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site