Messages in this thread | | | Date | Thu, 21 Mar 2013 17:27:11 +0800 | From | Alex Shi <> | Subject | Re: [patch v5 14/15] sched: power aware load balance |
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On 03/21/2013 04:41 PM, Preeti U Murthy wrote: >> > > Yes, I did find this behaviour on a 2 socket, 8 core machine very > consistently. > > rq->util cannot go to 0, after it has begun accumulating load right? > > Say a load was running on a runqueue which had its rq->util to be at > 100%. After the load finishes, the runqueue goes idle. For every > scheduler tick, its utilisation decays. But can never become 0. > > rq->util = rq->avg.runnable_avg_sum/rq->avg.runnable_avg_period
did you close all of background system services? In theory the rq->avg.runnable_avg_sum should be zero if there is no task a bit long, otherwise there are some bugs in kernel. Could you check the value under /proc/sched_debug?
-- Thanks Alex
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