Messages in this thread | | | Subject | Re: [cgroup] a0f9ec1f181: -4.3% will-it-scale.per_thread_ops | From | Mike Galbraith <> | Date | Thu, 15 May 2014 09:11:17 +0200 |
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On Thu, 2014-05-15 at 02:14 -0400, Tejun Heo wrote:
> Hmmm... I'm completely stumped. The commit in question has nothing to > do with tmpfs. It only affects three cgroup files - "tasks", > "cgroup.procs" and "release_agent". It can't possibly have any effect > on tmpfs operation. Maybe random effect through code alignment? Even > that is highly unlikely.
Unlikely, but it happens. I bisected a tbench regression down to a completely unrelated driver change, and watched it repeatably drop throughput 5% despite skeptical "No way, show me that trick again".
-Mike
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