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    SubjectRe: [PATCH] 2.5: push BKL out of llseek
    On Tue, 2002-01-29 at 20:26, Andrew Morton wrote:

    > Just a little word of caution here. Remember the
    > apache-flock-synchronisation fiasco, where removal
    > of the BKL halved Apache throughput on 8-way x86.
    > This was because the BKL removal turned serialisation
    > on a quick codepath from a spinlock into a schedule().

    I feared this too, but eventually I decided it was worth it and
    benchmarks backed that up. If nothing else this is yet-another-excuse
    for locks that can spin-then-sleep.

    I posted dbench results, which show a positive gain even on 2-way for
    multiple client loads.

    Robert Love

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