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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This archive was generated by hypermail 2b29 : Thu Jan 31 2002 - 21:01:12 EST