Re: dynamic-hz

Pavel Machek
2004-12-13T10:43:39Z

Hi!

> >Actually, I measured about 1W power savings with HZ=100. That's about
> >as much as spindown of disk saves...
>
> How does the popular proprietary operating system cope with this? My
> understanding is they run 1000Hz yet they have good power saving and quiet
> capacitors. Presumably they do a lot less per timer tick?

Doing lot less per timer tick is not going to help much... You cpu
needs to awaken, anyway, and awaking of CPU takes lot of time and lot
of power, and is probably going to take way more power than execution
of timer interrupt.
Pavel

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