Re: dynamic-hz

Andrea Arcangeli
2004-12-12T23:43:39Z

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.