Messages in this thread | | | Date | Wed, 14 Mar 2007 15:45:03 -0400 | From | Rik van Riel <> | Subject | Re: Stolen and degraded time and schedulers |
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Jeremy Fitzhardinge wrote:
>> How is time quantum getting stolen less important? Time quantum >> getting stolen results directly in more unnecessary context switches >> since we might steal the entire timeslice before the process even ran. > > It doesn't matter why you didn't get the time;
Oh, but it does.
System administrators can use steal time the same way they use iowait time: to spot bottlenecks on their systems.
If you have a lot of iowait time, you know you want either faster IO or more memory.
If you have a lot of steal time, you know you need to spread your virtual machines over more CPUs.
Steal time allows you to see the difference between a busy system and an overloaded system.
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