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    SubjectRe: [Ext2-devel] Re: Latest ext3 patches (extents, mballoc, delayed allocation)
    Alex Tomas wrote:

    > Good day all,
    >
    > I've updated the patchset against 2.6.10. A bunch of bugs have been
    > fixed and mballoc now behaves smarter a bit. Extents and mballoc
    > patches collects some stats they print upon umount. NOTE: they must
    > not be used to store important data. A lot of things are to be done.
    >

    Thanks Alex, for the hard work.

    > Please review. Any comments and suggestions are very welcome.

    Will do.

    >
    >
    > The followins crazy listing shows tiobench's results for SMP box:
    >
    > Random Reads
    > File Blk Num Avg CPU
    > Identifier Size Size Thr Rate (CPU%) Latency Eff
    > ---------------------------- ------ ----- --- ------ ------ --------- -----
    > ext2 512 4096 1 119.05 40.37% 0.031 295
    > ext3 512 4096 1 134.78 37.08% 0.028 363
    > ext3rs 512 4096 1 25.18 8.377% 0.154 301

    The throughput here is really weird. Reservation code does not touch
    read code path. I could imagine that it maybe change the disk layout and
    make a difference on sequential reads, but I am not sure how it will
    affect the random read. And this is happening on 1 thread and 4 threads,
    but for 2 threads, reservation case is the best. I will see if I could
    repeat the same results here.

    Mingming
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