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

[Ingo Molnar <mingo@xxxxxxx>]

* Jeremy Fitzhardinge <jeremy@xxxxxxxx> 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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