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    SubjectRe: Do not overload dispatch queue (Was: Re: IO scheduler based IO controller V10)
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    On Sat, 2009-10-03 at 17:14 +0200, Jens Axboe wrote:
    > On Sat, Oct 03 2009, Mike Galbraith wrote:
    > > On Sat, 2009-10-03 at 16:28 +0200, Jens Axboe wrote:
    > > > On Sat, Oct 03 2009, Mike Galbraith wrote:
    > > > > On Sat, 2009-10-03 at 09:56 -0400, Vivek Goyal wrote:
    > > > >
    > > > > > I have kept the overload delay period as "cfq_slice_sync" same as Mike had
    > > > > > done. We shall have to experiment what is a good waiting perioed. Is 100ms
    > > > > > too long if we are waiting for a request from same process which recently
    > > > > > finished IO and we did not enable idle on it.
    > > > > >
    > > > > > I guess we can tweak the delay period as we move along.
    > > > >
    > > > > I kept the delay period very short to minimize possible damage. Without
    > > > > the idle thing, it wasn't enough, but with, worked a treat, as does your
    > > > > patch.
    > > >
    > > > Can you test the current line up of patches in for-linus? It has the
    > > > ramp up I talked about included as well.
    > >
    > > Well, it hasn't hit git.kernel.org yet, it's at...
    > >
    > > * block-for-linus 1d22351 cfq-iosched: add a knob for desktop interactiveness
    >
    > It's the top three patches here, kernel.org sync sometimes takes a
    > while...
    >
    > http://git.kernel.dk/?p=linux-2.6-block.git;a=shortlog;h=refs/heads/for-linus

    Ok, already had the first two in, added the last.

    Entered uncharted territory for konsole -e exit, but lost a bit of
    throughput for home-brew concurrent git test.

    perf stat 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

    perf stat testo.sh Avg
    108.12 106.33 106.34 97.00 106.52 104.8 1.000 fairness=0 overload_delay=0
    93.98 102.44 94.47 97.70 98.90 97.4 .929 fairness=0 overload_delay=1
    90.87 95.40 95.79 93.09 94.25 93.8 .895 fairness=1 overload_delay=0
    89.93 90.57 89.13 93.43 93.72 91.3 .871 fairness=1 overload_delay=1
    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 block-for-linus

    -Mike



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