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SubjectRe: The "best" value of HZ
On Friday 28 October 2005 00:18, Claudio Scordino wrote:
> Hi,
> during the last years there has been a lot of discussion about the
> "best" value of HZ... On i386 was 100, then became 1000, and finally was
> set to 250. I'm thinking to do an evaluation of this parameter using
> different architectures.
> Has anybody thought to give the possibility to modify the value of HZ at
> boot time instead of at compile time ? This would allow to easily test
> different values on different machines and create a table containing the
> "best" value for each architecture... At this moment, instead, we have to
> recompile the kernel for each different value :(
> Do you think there would be much work to do that ?
> Do you think it would be a desired feature the knowledge of the best value
> for each architecture with more precision ?

Google for "dynticks". There's obviously an overhead associated with HZ not
being a constant (the compiler cannot optimise many expressions), but the
feature is being worked on nonetheless.


'No sense being pessimistic, it probably wouldn't work anyway.'
Third year Computer Science undergraduate.
1F2 55 South Clerk Street, Edinburgh, UK.
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