On Fri, Nov 02, 2007 at 08:56:46PM -0400, Chuck Ebbert wrote:
> On 11/02/2007 07:01 PM, Nick Piggin wrote:
> >
> > In the contended multi-threaded tight loop, the xchg lock is slower than inc
> > lock but still beats the fair xadd lock, but that's only because it is
> > just as unfair if not more so on this hardware (runtime difference of up to
> > about 10%)
> >
>
> I meant xchg for unlock, not lock.
That is for unlock. 2x the number of atomic operations ~= 2x the cost.
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