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    SubjectRe: [PATCH 00/19] Hardware Accelerated MD RAID5: Introduction
    On Wed, Sep 13, 2006 at 12:17:55PM -0700, Dan Williams wrote:
    ...
    > >Out of curiosity; how does accelerated compare to non-accelerated?
    >
    > One quick example:
    > 4-disk SATA array rebuild on iop321 without acceleration - 'top'
    > reports md0_resync and md0_raid5 dueling for the CPU each at ~50%
    > utilization.
    >
    > With acceleration - 'top' reports md0_resync cpu utilization at ~90%
    > with the rest split between md0_raid5 and md0_raid5_ops.
    >
    > The sync speed reported by /proc/mdstat is ~40% higher in the accelerated
    > case.

    Ok, nice :)

    >
    > That being said, array resync is a special case, so your mileage may
    > vary with other applications.

    Every-day usage I/O performance data would be nice indeed :)

    > I will put together some data from bonnie++, iozone, maybe contest,
    > and post it on SourceForge.

    Great!

    --

    / jakob

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