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Old 08-04-2016, 09:13 PM   #1
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Linux scheduler: Measuring the idleness of a CPU


I couldn't understand the explanation about idleness of a CPU in below PDF.

%util of cpu1 < %util of cpu0
Thus cpu1 is less idle than cpu0
Why cpu1(utilization:30%) is LESS idle than cpu0(utilization:100%)?
The cpu1 seems to be MORE idle than cpu0. doesn't it?
(do I understand correctly the term 'Idle'?)

You can find the explanation on the page of
'Measuring the idleness of a CPU' in

Old 08-08-2016, 08:56 PM   #2
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Mistic I think the quy is referencing the idleness of the scheduler, suggesting that a CPU that runs a task consistently is idle from the schedulers perspective, however workloads processing through a second CPU represent workload for the scheduler.
At least I think that's what he's trying to convey, he's not clear in his power point
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Old 08-09-2016, 05:25 AM   #3
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Aha, your explanation seems to be right :-)
Thanks for your comments!


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