Re: dynamic-hz

[Con Kolivas]

Andrea Arcangeli writes:

> On Mon, Dec 13, 2004 at 10:36:19AM +1100, Con Kolivas wrote:
> > The performance benefit, if any, is often lost in noise during 
> > benchmarks and when there, is less than 1%. So I was wondering if you 
> > had some specific advantage in mind for this patch? Is there some 
> > arch-specific advantage? I can certainly envision disadvantages to lower Hz.
>
> My last number I've here is 1% for kernel compile. We're not talking
> fancy desktop stuff here, we're talking about raw computing servers that
> runs in userspace 99.9% of the time where the 1% loss is going to be
> multiplied dozen or hundred of times. For those HZ=1000 is a pure
> tangible disavantage.
>
> For desktops 1% of cpu being lost is not an issue of course.

Thanks. I have to admit that the real reason I wrote this email was for this 
discussion to go on record so that desktop users would not get 
inappropriately excited by this change.

Cheers,
Con

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