Messages in this thread | | | Date | Thu, 20 May 2010 21:35:47 +1000 | From | Nigel Cunningham <> | Subject | Re: [patch 0/7] sched: change nohz idle load balancing logic to push model |
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Hi.
On 20/05/10 21:17, Dominik Brodowski wrote: > Hey, > > On Thu, May 20, 2010 at 09:07:42PM +1000, Nigel Cunningham wrote: >> "Load balancing tick" is still number one in my powertop list of top >> causes of wakeups (sitting at ~60 to 80 per second as I type this, with >> ~170 wakeups per second total). Comparing this to the numbers I posted >> earlier, we seem to have a win. >> >> I do wonder, though, whether further work could still be done. If I take >> one core offline, for example, I'm still getting load balancing ticks. >> Intuitively, I'd expect there to be no need for them with only one core >> available. But maybe I'm just ignorant of what's going on. > > Are you using HZ=1000, and is the CPU active ~ 6-8 % ? If so, is it just the > regular timer tick while the CPU is active, and so not a real "wakeup"? (Or > possibly double the number if both CPUs are active)
HZ is 1000, and the CPU running percentage in Powertop is low (2% when I'm not typing).
Regards,
Nigel
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