On Wed, Nov 29, 2023 at 03:29:05PM -0600, Nathan Bossart wrote: > I haven't done any sort of performance testing on this yet. Some > preliminary web searches suggest that there is unlikely to be much > difference between cmpxchg and xchg, but presumably there's some difference > between xchg and doing cmpxchg in a while loop (as is done in > atomics/generic.h today). I'll report back once I've had a chance to do > some testing...
Some rudimentary tests show a >40% speedup with this patch on x86_64. -- Nathan Bossart Amazon Web Services: https://aws.amazon.com
