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    SubjectRe: [patch] optimize disk_round_stats
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    On Thu, 2005-10-13 at 12:19 -0700, Chen, Kenneth W wrote:
    > Following the same idea, it occurs to me that we should only update
    > disk stat when "now" is different from disk->stamp. Otherwise, we
    > are again needlessly adding zero to the stats.

    have you measured this?
    Conditionals in code are not free, so it might well be more expensive...

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