Re: [Xen-devel] [PATCH 00/10] [PATCH RFC V2] Paravirtualized ticketlocks

From: Jeremy Fitzhardinge
Date: Thu Oct 06 2011 - 14:09:26 EST

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.

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