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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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