Messages in this thread | | | Date | Fri, 09 Jun 2006 16:05:08 +1000 | From | Peter Williams <> | Subject | Re: [ckrm-tech] [RFC 0/4] sched: Add CPU rate caps (improved) |
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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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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