On Fri, Oct 28, 2005 at 01:18:41AM +0200, Claudio Scordino wrote:
> Hi,
Hi Claudio,
> 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 ?
the best value for HZ is not architecture specific, it depends on the
usage pattern.
The rule is roughly:
- low HZ for computations
- high HZ for interactive usage
Making HZ selectable at boot time wouldn't be hard, but I doubt it's
worth it because it would make the kernel both bigger and slower.
> Thanks,
>
> Claudio
cu
Adrian
--
"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed
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