On Tue, 12 Jul 2005, Blaisorblade wrote:
> On Tuesday 12 July 2005 07:26, Victor Condino wrote:
> > just noticed something interesting while testing out my gentoo/uml
> > root-fs generation script on my laptop. my l/t is an thinkpad T42p,
> > which has a p3 centrino with speedstep. i use cpufreqd to throttle the
> > cpu when not on ac between 600 and 1800MHz based on load. what i noticed
> > is that when I fired up UML while the host's core frequency was at
> > 600mhz, /proc/cpuinfo reported ~600 bogomips in the guest, but when i
> > put some load on the host and cpufreq stepped up the core frequency, UML
> > still reports ~600 bogomips. likewise, when I fired up UML while the
> > host was under load and it's core at 1200MHz, UML reports higher
> > bogomips, but then when the host drops back down to the lower core freq,
> > UML still reports the same higher bogomips.
>
> > Not that this actually affects anything I do or would affect most
> > people... just thought you guys might want to know =D
> Hmm, bogomips are calculated at startup and that won't change easily.
> However,
> they become inaccurate in a much wider variety of situation, for instance
> when there's some load on the host; so, using CONFIG_UML_REAL_TIME_CLOCK
> (IIRC) uses the host clock for time calculation.
>
> When you disable this option, I guess that a "sleep 10" when host is at 600,
> if UML was started at 1800, might last 30 seconds more or less...
I don't think user space sleep uses the kernel's udelay() or mdelay()...
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- [EMAIL PROTECTED]
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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