Re: [REPORT] cfs-v4 vs sd-0.44

[Ingo Molnar]

* Ingo Molnar <mingo@xxxxxxx> wrote:

> sorry, i was a bit imprecise here. There is a case where CFS can give 
> out a 'loan' to tasks. The scheduler tick has a low resolution, so it 
> is fundamentally inevitable [*] that tasks will run a bit more than 
> they should, and at a heavy context-switching rates these errors can 
> add up significantly. Furthermore, we want to batch up workloads.
> 
> So CFS has a "no loans larger than sched_granularity_ns" policy (which 
> defaults to 5msec), and it captures these sub-granularity 'loans' with 
> nanosec accounting. This too is a very sane economic policy and is 
> anti-infationary :-)

at which point i guess i should rename CFS to 'EFS' (the Economic Fair 
Scheduler)? =B-)

	Ingo
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