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Date: 05 Oct 2006 22:57:24 +0200 From: Andi Kleen <ak@...e.de> To: Ingo Molnar <mingo@...e.hu> Cc: Thomas Gleixner <tglx@...utronix.de>, LKML <linux-kernel@...r.kernel.org>, John Stultz <johnstul@...ibm.com>, Valdis Kletnieks <valdis.kletnieks@...edu>, Arjan van de Ven <arjan@...radead.org>, Dave Jones <davej@...hat.com>, David Woodhouse <dwmw2@...radead.org>, Jim Gettys <jg@...top.org>, Roman Zippel <zippel@...ux-m68k.org>, akpm@...l.org Subject: Re: [patch 00/22] high resolution timers / dynamic ticks - V3 Ingo Molnar <mingo@...e.hu> writes: > * Andrew Morton <akpm@...l.org> wrote: > > > With CONFIG_HIGH_RES_TIMERS=y, CONFIG_NO_HZ=n it's pretty sick. It > > pauses for several seconds after "input: AlpsPS/2 ALPS GlidePoint as > > /class/input/input2" (printk-time claims 2 seconds, but it was longer > > than that). > > > > It's been stuck for a minute or more at the 12.980000 time, seems to > > have hung. The cursor is flashing extremely slowly. > > ah, that's still the VAIO, right? Do you get a 'slow' LOC count on > /proc/interrupts even on a stock kernel? If yes then that's a > fundamentally sick local APIC timer interrupt. Stock kernel should show > sickness too, if for example you boot an SMP kernel on it - can you > confirm that? (the UP-IOAPIC only relies for profiling on the lapic > timer, so there the only sickness you should see on the stock kernel is > a non-working readprofile) When I was hacking on my old noidletick patch I ran into this problem on several machines too. But usually the problem wasn't that it was too slow, but that it completely stopped in C2 or deeper. I don't think there is a way to work around that except for not using C2 or deeper (not an option) or using a different timer source. If that is true then hitting space lots of time will make it go faster. -andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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