Messages in this thread | | | Date | Sun, 16 May 2004 15:20:20 +0200 | From | Rutger Nijlunsing <> | Subject | Re: cpufreq and p4 prescott |
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> > The only thing I could find in Intel's documentation is the max. time > > of throttling is 3 microseconds (p.67; 5.2.1 of Prescott > > datasheet). So this 3 microseconds should correspond to 5600 ticks or > > so... > > Can't find it in the datasheets right now, but did find an interesting > comment in section 13.15.3 of 24547212.pdf which explains the strange > behaviour we're seeing.
Hm, 13.16.3 in my version, but indeed: all logical processors should be put asleep in the same way ;)
> > > I know this is not P4 specific, but motherboard specific, but do > > you know of modules which use motherboard specific knowledge to scale > > the processor? > No. > > If the BIOS can do it, so should we be able to do it. > > Dynamic frequency scaling is (probably) way different from setting a > frequency at boot (which is what the BIOS does). Timing issues, settling > times, etc. are way too complicated, AFAICS. Even trying to do this might > result in severe non-recoverable hardware failures.
Probably true for some motherboards, but Asus got a WinXP program called 'AiBooster' which is a program to under/overclock from -50% to +33% runtime (butt-ugly UI can be seen in http://www.asuscom.de/pub/ASUS/mb/sock478/p4p800/AIBooster_u.pdf). Could Wine be used (given the right permissions) to run or disect such a utility to make underclocking reality under Linux?
*hopeful* Or has Asus released the specification of its motherboard?
-- Rutger Nijlunsing ---------------------------- rutger ed tux tmfweb nl never attribute to a conspiracy which can be explained by incompetence ---------------------------------------------------------------------- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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