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    SubjectRe: ext2/3 performance regression in 2.6 vs 2.4 for small interleaved writes
    Date
    On Thursday 12 February 2004 04:28, Rik van Riel wrote:
    > On Wed, 11 Feb 2004, Jon Burgess wrote:
    >
    > > Write speed in MB/s using an ext2 filesystem for 1 and 2 streams:
    > > Num streams: 1 2
    > > linux-2.4.22 10.47 6.98
    > > linux-2.6.2 9.71 0.34
    >
    > > During the disk light is on solid and it really slows any other disk
    > > access. It looks like the disk is continuously seeking backwards and
    > > forwards, perhaps re-writing the meta data.
    >
    > Just for fun, could you also try measuring how long it takes
    > to read back the files in question ?
    >
    > Both individually and in parallel...
    >

    2.4 has a deadline scheduler. 2.6 default is anticipatory.

    Could you please boot with scheduler=deadline to compare apples with apples.

    Regards
    Michael


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