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    SubjectRe: 2.6.20-rc2+: CFQ halving disk throughput.

    On Jan 2 2007 10:01, Mark Lord wrote:
    > Jens Axboe wrote:
    >>
    >> > But surely one of (not sure which) sync+async or async+sync may also
    >> > be okay?
    >> > Or would it?
    >>
    >> Async merge to sync request should be ok. But I wonder what happens with
    >> hdparm, since it seems to trigger one of these tests. Very puzzling.
    >> I'll dive in and take a look.
    >
    > The code (written 10 years ago) isn't the best in the world,
    > and will be redone entirely for hdparm-7.0 this year.
    >
    > But right now, it essentially does this:
    >
    > loop:
    > seek( to sector zero );
    > read( 2MBytes );
    > repeat loop for 3 seconds

    Well for pure reading speed, I already use dd_rescue -d /dev/hda /dev/null
    Gives the same as hdparm -t when acting on uncached data.


    -`J'
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