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    SubjectRe: [PATCH 0/5] multiple block allocation to current ext3
    Mingming Cao <cmm@us.ibm.com> wrote:
    >
    > Tests done so far includes fsx,tiobench and dbench. The following
    > numbers collected from Direct IO tests (1G file creation/read) shows
    > the system time have been greatly reduced (more than 50% on my 8 cpu
    > system) with the patches.
    >
    > 1G file DIO write:
    > 2.6.15 2.6.15+patches
    > real 0m31.275s 0m31.161s
    > user 0m0.000s 0m0.000s
    > sys 0m3.384s 0m0.564s
    >
    >
    > 1G file DIO read:
    > 2.6.15 2.6.15+patches
    > real 0m30.733s 0m30.624s
    > user 0m0.000s 0m0.004s
    > sys 0m0.748s 0m0.380s
    >
    > Some previous test we did on buffered IO with using multiple blocks
    > allocation and delayed allocation shows noticeable improvement on
    > throughput and system time.

    I'd be interested in seeing benchmark results for the common
    allocate-one-block case - just normal old buffered IO without any
    additional multiblock patches. Would they show any regression?
    -
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