Messages in this thread | | | Subject | Re: spinlock efficiency problem [was 2.5.57 IO slowdown with CONFIG_PREEMPT enabled) | From | Alan <> | Date | 21 Jan 2003 03:22:42 +0000 |
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On Mon, 2003-01-20 at 22:58, Joe Korty wrote: > The new, preemptable spin_lock() spins on an atomic bus-locking > read/write instead of an ordinary read, as the original spin_lock > implementation did. Perhaps that is the source of the inefficiency > being seen.
Its a fairly critical "Never do this" on older intel processors and kills the box very efficiently so your diagnosis is extremely plausible
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