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    SubjectRe: [PATCH 2.5.53] NUMA scheduler (1/3)
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    On Sat, 2003-01-04 at 21:35, Martin J. Bligh wrote:
    > >> Here comes the minimal NUMA scheduler built on top of the O(1) load
    > >> balancer rediffed for 2.5.53 with some changes in the core part. As
    > >> suggested by Michael, I added the cputimes_stat patch, as it is
    > >> absolutely needed for understanding the scheduler behavior.
    > >
    > > Thanks for this latest patch. I've managed to cobble together
    > > a 4 node NUMAQ system (16 700 MHZ PIII procs, 16GB memory) and
    > > ran kernbench and schedbench on this, along with the 2.5.50 and
    > > 2.5.52 versions. Results remain fairly consistent with what
    > > we have been obtaining on earlier versions.
    > >
    > > Kernbench:
    > > Elapsed User System CPU
    > > sched50 29.96s 288.308s 83.606s 1240.8%
    > > sched52 29.836s 285.832s 84.464s 1240.4%
    > > sched53 29.364s 284.808s 83.174s 1252.6%
    > > stock50 31.074s 303.664s 89.194s 1264.2%
    > > stock53 31.204s 306.224s 87.776s 1263.2%
    >
    > Not sure what you're correllating here because your rows are all named
    > the same thing. However, the new version seems to be much slower
    > on systime (about 7-8% for me), which roughly correllates with your
    > last two rows above. Me no like.

    Sorry, I forgot to include a bit better description of what the
    row labels mean.

    sched50 = linux 2.5.50 with the NUMA scheduler
    sched52 = linux 2.5.52 with the NUMA scheduler
    sched53 = linux 2.5.53 with the NUMA scheduler
    stock50 = linux 2.5.50 without the NUMA scheduler
    stock53 = linux 2.5.53 without the NUMA scheduler

    Thus, this shows that the NUMA scheduler drops systime by ~5.5 secs,
    or roughly 8%. So, my testing is not showing an increase in systime
    like you apparently are seeing.

    Michael
    --
    Michael Hohnbaum 503-578-5486
    hohnbaum@us.ibm.com T/L 775-5486

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