Re: [PATCH v3 0/7] locking/qspinlock: Enhance pvqspinlock performance

[Waiman Long]

On 07/26/2015 09:18 PM, Davidlohr Bueso wrote:
> On Wed, 2015-07-22 at 16:12 -0400, Waiman Long wrote:
> > Patch 3 allows the collection of various count data that are useful
> > to see what is happening in the system. They do add a bit of overhead
> > when enabled slowing performance a tiny bit.
> Ah ok you do mention the overhead. Hmmm but what's a tiny bit? A kernel
> build comparison would be pretty nice to have a "usability" view.
>
> Thanks,
> Davidlohr

You will probably see a few seconds of slowdown for a kernel build that 
took 3 mins. So it is about a few percents and it varies a bit from run 
to run.

Cheers,
Longman
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