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    SubjectRe: [patch] Re: scheduler oddity [bug?]
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    On Mon, 2009-03-09 at 14:58 +0100, Mike Galbraith wrote:
    > On Mon, 2009-03-09 at 14:46 +0100, Peter Zijlstra wrote:
    > > On Mon, 2009-03-09 at 14:37 +0100, Mike Galbraith wrote:
    > > > On Mon, 2009-03-09 at 14:16 +0100, Mike Galbraith wrote:
    > > > > On Mon, 2009-03-09 at 12:04 +0100, Peter Zijlstra wrote:
    > > > >
    > > > > > OK, talked a bit with Ingo, the reason you're doing is that avg_overlap
    > > > > > can easily grow stale.. I can see that happen indeed.
    > > > > >
    > > > > > So the 'perfect' thing would be a task-runtime decay, barring that the
    > > > > > preemption thing seems a sane enough hart-beat of a task.
    > > > > >
    > > > > > How does the below look to you?
    > > > >
    > > > > Other than the fact that the test for sync reject is currently
    > > > > avg_overlap > sysctl_sched_migration_cost, looks fine to me. Having it
    > > > > capped at the boundary is probably the better way to go.
    > > >
    > > > Heh, doesn't _quite_ work though. The little bugger now hovers just
    > > > under :-/
    > >
    > > > se.avg_overlap : 0.499993
    > >
    > > Right, update_avg()'s >>3 and the off-by-one you spotted.
    >
    > (that was with the off-by-one fixed, but..)
    >
    > > I recon stuff works better with a 2* added? After that I guess its
    > > praying sysbench still works.. :-)
    >
    > Yes 2* worked fine. Mysql+oltp was my worry spot, being a very affinity
    > sensitive little <bleep>, but my patchlet didn't cause any trouble, so
    > this one shouldn't either. I'll do some re-test in any case, and squeak
    > should anything turn up.

    Squeak! Didn't even get to mysql+oltp.

    marge:..local/tmp # netperf -t UDP_STREAM -l 60 -H 127.0.0.1 -- -P 15888,12384 -s 32768 -S 32768 -m 4096
    UDP UNIDIRECTIONAL SEND TEST from 0.0.0.0 (0.0.0.0) port 15888 AF_INET to 127.0.0.1 (127.0.0.1) port 12384 AF_INET
    Socket Message Elapsed Messages
    Size Size Time Okay Errors Throughput
    bytes bytes secs # # 10^6bits/sec

    65536 4096 60.00 5161103 0 2818.65
    65536 60.00 5149666 2812.40

    6188 root 20 0 1040 544 324 R 100 0.0 0:31.49 0 netperf
    6189 root 20 0 1044 260 164 R 48 0.0 0:15.35 3 netserver

    Hurt, pain, ouch, vs...

    marge:..local/tmp # netperf -t UDP_STREAM -l 60 -H 127.0.0.1 -T 0,0 -- -P 15888,12384 -s 32768 -S 32768 -m 4096
    UDP UNIDIRECTIONAL SEND TEST from 0.0.0.0 (0.0.0.0) port 15888 AF_INET to 127.0.0.1 (127.0.0.1) port 12384 AF_INET : cpu bind
    Socket Message Elapsed Messages
    Size Size Time Okay Errors Throughput
    bytes bytes secs # # 10^6bits/sec

    65536 4096 60.00 8452028 0 4615.93
    65536 60.00 8442945 4610.97

    Drat.

    -Mike



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