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    SubjectRe: [PATCH] cfq-iosched: reduce write depth only if sync was delayed
    On Sun, Dec 06 2009, Corrado Zoccolo wrote:
    > Hi Jeff,
    > I remember you saw large performance drop on your SAN for sequential
    > writes with low_latency=1. Can you test if Shaohua's and this patch
    > fix allow to recover some bandwidth? I think that enabling the queue
    > depth ramp up only if a sync request was delayed should disable it for
    > fast hardware like yours, so you should not be seeing the slowdown any
    > more.

    I queued this up for post inclusion into 2.6.33, with the time_after()

    The patch was word-wrapped, btw.

    Jens Axboe

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      Last update: 2009-12-06 11:53    [W:0.018 / U:54.096 seconds]
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