Messages in this thread | | | Date | Mon, 23 Jun 2014 17:20:30 -0700 | From | Dave Hansen <> | Subject | Re: [PATCH tip/core/rcu] Reduce overhead of cond_resched() checks for RCU |
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On 06/23/2014 05:15 PM, Paul E. McKenney wrote: > Just out of curiosity, how many CPUs does your system have? 80? > If 160, looks like something bad is happening at 80.
80 cores, 160 threads. >80 processes/threads is where we start using the second thread on the cores. The tasks are also pinned to hyperthread pairs, so they disturb each other, and the scheduler moves them between threads on occasion which causes extra noise.
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