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    SubjectRe: [MMTests] dbench4 async on ext3
    On Mon 23-07-12 22:21:46, Mel Gorman wrote:
    > Configuration: global-dhp__io-dbench4-async-ext3
    > Result: http://www.csn.ul.ie/~mel/postings/mmtests-20120424/global-dhp__io-dbench4-async-ext3
    > Benchmarks: dbench4
    >
    > Summary
    > =======
    >
    > In general there was a massive drop in throughput after 3.0. Very broadly
    > speaking it looks like the Read operation got faster but at the cost of
    > a big regression in the Flush operation.
    Mel, I had a look into this and it's actually very likely only a
    configuration issue. In 3.1 ext3 started to default to enabled barriers
    (barrier=1 in mount options) which is a safer but slower choice. When I set
    barriers explicitely, I see no performance difference for dbench4 between
    3.0 and 3.1.

    Honza
    --
    Jan Kara <jack@suse.cz>
    SUSE Labs, CR


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