Messages in this thread | | | Date | Wed, 05 Feb 2014 22:10:34 -0500 | From | Waiman Long <> | Subject | Re: [PATCH v3 1/2] qspinlock: Introducing a 4-byte queue spinlock implementation |
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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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