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    SubjectRe: RFC on io-stalls patch


    On Mon, 14 Jul 2003, Jens Axboe wrote:

    > Some initial results with the attached patch, I'll try and do some more
    > fine grained tomorrow. Base kernel was 2.4.22-pre5 (obviously), drive
    > tested is a SCSI drive (on aic7xxx, tcq fixed at 4), fs is ext3. I would
    > have done ide testing actually, but the drive in that machine appears to
    > have gone dead. I'll pop in a new one tomorrow and test on that too.
    >
    > no_load:
    > Kernel [runs] Time CPU% Loads LCPU% Ratio
    > 2.4.22-pre5 2 134 196.3 0.0 0.0 1.00
    > 2.4.22-pre5-axboe 3 133 196.2 0.0 0.0 1.00
    > ctar_load:
    > Kernel [runs] Time CPU% Loads LCPU% Ratio
    > 2.4.22-pre5 3 235 114.0 25.0 22.1 1.75
    > 2.4.22-pre5-axboe 3 194 138.1 19.7 20.6 1.46
    > xtar_load:
    > Kernel [runs] Time CPU% Loads LCPU% Ratio
    > 2.4.22-pre5 3 309 86.4 15.0 14.9 2.31
    > 2.4.22-pre5-axboe 3 249 107.2 11.3 14.1 1.87
    > io_load:
    > Kernel [runs] Time CPU% Loads LCPU% Ratio
    > 2.4.22-pre5 3 637 42.5 120.2 18.5 4.75
    > 2.4.22-pre5-axboe 3 540 50.0 103.0 18.1 4.06
    > io_other:
    > Kernel [runs] Time CPU% Loads LCPU% Ratio
    > 2.4.22-pre5 3 576 47.2 107.7 19.8 4.30
    > 2.4.22-pre5-axboe 3 452 59.7 85.3 19.5 3.40
    > read_load:
    > Kernel [runs] Time CPU% Loads LCPU% Ratio
    > 2.4.22-pre5 3 150 181.3 8.1 9.3 1.12
    > 2.4.22-pre5-axboe 3 152 178.9 8.2 9.9 1.14

    Awesome. I'll add it in -pre6.

    Thanks a lot Jens.

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