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    SubjectRe: updated: ext3 IO latency measurements on v2.6.30-rc1
    On 10.04.2009, Ingo Molnar wrote: 

    > This is an update to the ext3+CFQ latency measurements i did early
    > in the merge window - originally with a v2.6.29 based kernel.
    >
    > Today i've repeated my measurements under v2.6.30-rc1, using the
    > exact same system and the exact same workload.
    >
    > The quick executive summary:
    >
    > _what a difference a week of upstream development makes_!

    Here's a quicktest with xfs+CFQ on one of my testing machines,
    using fsync-tester while running Linus' "bigfile torture test".
    It underlines your results, showing significant improvement!

    The xfs partition is mounted with the defaults, and I'm expecting
    slightly more improvement after mounting with noatime and nobarrier.

    2.6.30-rc1

    fsync time: 0.4674
    fsync time: 1.0473
    fsync time: 0.4190
    fsync time: 1.0800
    fsync time: 1.0132
    fsync time: 1.0193
    fsync time: 1.0191
    fsync time: 1.1318
    fsync time: 0.9924
    fsync time: 1.0568
    fsync time: 1.0676
    fsync time: 1.0241
    fsync time: 1.0530
    fsync time: 0.9709
    fsync time: 0.4475
    fsync time: 0.6320
    fsync time: 1.0906
    fsync time: 0.6344
    fsync time: 1.0632
    fsync time: 1.0455
    fsync time: 1.0530
    fsync time: 1.0655
    fsync time: 1.0032
    fsync time: 1.0644
    fsync time: 1.1573
    fsync time: 1.0197
    fsync time: 1.0342
    fsync time: 1.0643
    fsync time: 0.0342
    fsync time: 0.7603
    fsync time: 1.0905
    fsync time: 0.6340

    2.6.29.1

    fsync time: 2.1255
    fsync time: 2.2851
    fsync time: 1.9048
    fsync time: 1.0999
    fsync time: 2.0117
    fsync time: 2.0819
    fsync time: 2.0819
    fsync time: 0.0225
    fsync time: 0.2796
    fsync time: 0.3879
    fsync time: 0.6584
    fsync time: 0.9287
    fsync time: 0.2488
    fsync time: 2.0994
    fsync time: 2.0161
    fsync time: 1.9736
    fsync time: 2.0231
    fsync time: 2.2888
    fsync time: 2.1719
    fsync time: 1.8452
    fsync time: 0.3278
    fsync time: 1.0881
    fsync time: 0.5202
    fsync time: 1.3339
    fsync time: 0.4295
    fsync time: 1.2772
    fsync time: 1.9436
    fsync time: 2.1048
    fsync time: 1.9376
    fsync time: 2.0786
    fsync time: 1.9202



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