Re: [PATCH v3 1/2] qspinlock: Introducing a 4-byte queue spinlockimplementation

[Waiman Long]

On 02/03/2014 06:40 AM, Peter Zijlstra wrote:
> On Fri, Jan 31, 2014 at 02:24:33PM -0500, Waiman Long wrote:
> > Light contention is the only case where the qspinlock may not perform as
> > good as the ticket spinlock. I know this is the most common case. However, I
> > would argue that the slowdown, if any, will not be really noticeable. This
> > is what I will try to find out.
> Please also explain why things are slower/faster. Thomas tried to get
> you to do so a few months back, but you kept deflecting.

It is not easy to have a test case to test light contention. I am trying 
to create custom test case to get that data.

-Longman
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