[lkml]   [2006]   [Jun]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
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?


Dr Peter Williams, Chief Scientist <>
Aurema Pty Limited
Level 2, 130 Elizabeth St, Sydney, NSW 2000, Australia
Tel:+61 2 9698 2322 Fax:+61 2 9699 9174
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2006-06-09 08:10    [W:0.026 / U:23.512 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site