Messages in this thread | | | Date | Mon, 10 Oct 2011 09:32:14 +0200 | From | Ingo Molnar <> | Subject | Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks |
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* Jeremy Fitzhardinge <jeremy@goop.org> wrote:
> On 10/06/2011 10:40 AM, Jeremy Fitzhardinge wrote: > > However, it looks like locked xadd is also has better performance: on > > my Sandybridge laptop (2 cores, 4 threads), the add+mfence is 20% slower > > than locked xadd, so that pretty much settles it unless you think > > there'd be a dramatic difference on an AMD system. > > Konrad measures add+mfence is about 65% slower on AMD Phenom as well.
xadd also results in smaller/tighter code, right?
Thanks,
Ingo
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