Re: [PATCH v2 0/4] locking/mutex: Enable optimistic spinning of lock waiter

[Waiman Long]

On 02/16/2016 03:51 AM, Peter Zijlstra wrote:
> On Fri, Feb 12, 2016 at 12:32:11PM -0500, Waiman Long wrote:
> > My own test on a 4-socket E7-4820 v3 system showed a regression of
> > about 4% in the high_systime workload with Peter's patch which this
> > new patch effectively eliminates.
> >
> > Testing on an 8-socket Westmere-EX server, however, has performance
> > change from -9% to than +140% on the fserver workload of AIM7
> > depending on how the system was set up.
> Subject: [lkp] [locking/mutex] aaca135480: -72.9% fsmark.files_per_sec
>
> My patch also generated the above email.
>
> Please also test that benchmark against this approach.

I will ran that benchmark on my patch.

Cheers,
Longman