Andrea Arcangeli <[EMAIL PROTECTED]> wrote:
> It seems more similar to my code btw (you finally killed the useless
> chmxchg ;).
CMPXCHG ought to make things better by avoiding the XADD(+1)/XADD(-1) loop,
however, I tried various combinations and XADD beats CMPXCHG significantly.
Here's a quote
On Wed, Apr 25, 2001 at 09:06:38PM +0100, D . W . Howells wrote:
> This patch (made against linux-2.4.4-pre6 + rwsem-opt3) somewhat improves
> performance on the i386 XADD optimised implementation:
It seems more similar to my code btw (you finally killed the useless
chmxchg ;).
I only had a sho
This patch (made against linux-2.4.4-pre6 + rwsem-opt3) somewhat improves
performance on the i386 XADD optimised implementation:
A patch against -pre6 can be obtained too:
ftp://infradead.org/pub/people/dwh/rwsem-pre6-opt4.diff
Here's some benchmarks (take with a pinch of salt of cours
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