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SubjectRe: [ckrm-tech] [RFC 0/4] sched: Add CPU rate caps (improved)
MAEDA Naoaki wrote:
> Peter Williams wrote:
>> I've done some informal testing with smaller values of CAP_STATS_OFFSET
>> and there is only a minor improvement.
>>
>> However, something that does improve behaviour for short lived tasks is
>> to increase the value of HZ. This is because the basic unit of CPU
>> allocation by the scheduler is 1/HZ and this is also the minimum time
>> (and granularity) with which sinbinning and other capping measures can
>> be implemented. This is the fundamental limiting factor for the
>> accuracy of capping i.e. if everything worked perfectly the best
>> granularity that can be expected from capping of short lived tasks is
>> 1000 / (HZ * duration) where duration is in seconds.
>
> I already defines CONFIG_HZ=1000. Do you suggest increasing more?

No.

Peter
--
Dr Peter Williams, Chief Scientist <peterw@aurema.com>
Aurema Pty Limited
Level 2, 130 Elizabeth St, Sydney, NSW 2000, Australia
Tel:+61 2 9698 2322 Fax:+61 2 9699 9174 http://www.aurema.com
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