lkml.org 
[lkml]   [2009]   [Sep]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRE: question on sched-rt group allocation cap: sched_rt_runtime_us
    From
    Date
    On Sun, 2009-09-06 at 17:18 -0700, Anirban Sinha wrote:
    >
    >
    > > Dunno. Fly or die little patchlet (toss).
    >
    > > sched: allow the user to disable RT bandwidth aggregation.
    >
    > Hmm. Interesting. With this change, my results are as follows:
    >
    > rt_runtime/rt_period % of reg iterations
    >
    > 0.2 100%
    > 0.25 100%
    > 0.3 100%
    > 0.4 100%
    > 0.5 82%
    > 0.6 66%
    > 0.7 54%
    > 0.8 46%
    > 0.9 38.5%
    > 0.95 32%
    >
    >
    > This results are on a quad core blade. Does it still makes sense
    > though?
    > Can anyone else run the same tests on a quadcore over the latest
    > kernel? I will patch our 2.6.26 kernel with upstream fixes and rerun
    > these tests on tuesday.

    I tested tip (v2.6.31-rc9-1357-ge6a3cd0) with a little perturbation
    measurement proglet on an isolated Q6600 core.

    10s measurement interval results:

    sched_rt_runtime_us RT utilization
    950000 94.99%
    750000 75.00%
    500000 50.04%
    250000 25.02%
    50000 5.03%

    Seems to work fine here.

    -Mike



    \
     
     \ /
      Last update: 2009-09-07 08:57    [W:0.023 / U:1.036 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site