Messages in this thread | | | Date | Fri, 30 Jun 2006 23:09:22 +0200 | From | Pavel Machek <> | Subject | Re: [PATCHSET] Announce: High-res timers, tickless/dyntick and dynamic HZ -V4 |
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Hi!
> > > > I briefly tested -dyntick5 on my thinkpad, and it seems to work > > > > okay... but timer still seems to tick at 250Hz. > > > > > > > ...am I doing something wrong? > > > > > > can you send me the bootlog and your .config file please ? > > > > ...attached. (I do not have to enable anything in sysfs/commandline to > > enable noidlehz, right?). > > Right. > > You trapped into the no apic on SMP trap. I did not come around to fix > that yet. What happens that you don't have lapic on the commandline and > BIOS has lapic disabled. Therefor Linux switches to IPI broadcasting if > the PIT interrupt, which does not work with idle_hz and highres timer as > those are per cpu. I will fix that for SMP kernels which bring up only > one CPU. > > You can work around that for now by either using an UP kernel or > enabling local APIC, which is recommended anyway because the APIC timer > is faster to access and has longer max time than PIT.
Thanks, it works okay with UP kernel. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html - 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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