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    SubjectRe: Do not overload dispatch queue (Was: Re: IO scheduler based IO controller V10)
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    On Sun, 2009-10-04 at 20:38 +0200, Jens Axboe wrote:
    > On Sun, Oct 04 2009, Mike Galbraith wrote:
    > > On Sun, 2009-10-04 at 19:39 +0200, Jens Axboe wrote:
    > >
    > > > So I'll commit a change that doesn't do the delay at all, basically it
    > > > just offset the current code by one slice.
    > >
    > > Ok, when it hits block-for-linus, I'll take it out for a spin.
    >
    > It's committed:
    >
    > http://git.kernel.dk/?p=linux-2.6-block.git;a=commit;h=e00c54c36ac2024c3a8a37432e2e2698ff849594

    Looks like a keeper to me :)

    -Mike

    dd vs konsole -e exit
    Avg
    1.70 1.94 1.32 1.89 1.87 1.7 fairness=1 overload_delay=1
    1.55 1.79 1.38 1.53 1.57 1.5 desktop=1 +last_end_sync
    1.09 0.87 1.11 0.96 1.11 1.0 block-for-linus-8e29675
    1.29 2.18 1.16 1.21 1.24 1.4 block-for-linus-e00c54c

    concurrent git test
    Avg
    108.12 106.33 106.34 97.00 106.52 104.8 1.000 virgin
    89.81 88.82 91.56 96.57 89.38 91.2 .870 desktop=1 +last_end_sync
    92.61 94.60 92.35 93.17 94.05 93.3 .890 blk-for-linus-8e29675
    88.73 89.02 88.10 90.84 88.30 88.9 .848 blk-for-linus-e00c54c

    read vs write test

    desktop=0 Avg
    elapsed 98.23 91.97 91.77 93.9 sec 1.000
    30s-dd-read 48.5 49.6 49.1 49.0 mb/s 1.000
    30s-dd-write 23.1 27.3 31.3 27.2 1.000
    dd-read-total 49.4 50.1 49.6 49.7 1.000
    dd-write-total 34.5 34.9 34.9 34.7 1.000

    desktop=1 pop 8e296755 Avg
    elapsed 93.30 92.77 90.11 92.0 .979
    30s-dd-read 50.5 50.4 51.8 50.9 1.038
    30s-dd-write 22.7 26.4 27.7 25.6 .941
    dd-read-total 51.2 50.1 51.6 50.9 1.024
    dd-write-total 34.2 34.5 35.6 34.7 1.000

    desktop=1 push 8e296755 Avg
    elapsed 104.51 104.52 101.20 103.4 1.101
    30s-dd-read 43.0 43.6 44.5 43.7 .891
    30s-dd-write 21.4 23.9 28.9 24.7 .908
    dd-read-total 42.9 43.0 43.5 43.1 .867
    dd-write-total 30.4 30.3 31.5 30.7 .884

    latency=1 push e00c54c Avg
    elapsed 90.03 93.03 91.68 91.5 .974
    30s-dd-read 53.1 54.8 51.3 53.0 1.081
    30s-dd-write 20.0 23.3 28.2 23.8 .875
    dd-read-total 53.7 54.0 52.6 53.4 1.074
    dd-write-total 35.5 34.2 34.9 34.8 1.002




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