linux-kernel - Re: CONFIG_NO_HZ: missed ticks, stall (keyb IRQ required) [2.6.18-rc4-mm1]

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Message-ID: <20061107080733.GB9910@elte.hu>
Date:	Tue, 7 Nov 2006 09:07:33 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Len Brown <lenb@...nel.org>
Cc:	Andreas Mohr <andi@...x01.fht-esslingen.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org
Subject: Re: CONFIG_NO_HZ: missed ticks, stall (keyb IRQ required) [2.6.18-rc4-mm1]

* Len Brown <len.brown@...el.com> wrote:

> So given that C3 on every known system that has shipped to date breaks 
> the LAPIC timer (and apparently this applies to C2 on these AMD 
> boxes), dynticks needs a solid story for co-existing with C3.

check out 2.6.19-rc4-mm2: it detects this breakage and works it around 
by using the PIT as a clock-events source. That did the trick on my 
laptop which has this problem too. I agree with you that degrading the 
powersaving mode is not an option.

we've got a question about HPET: it seems all recent hardware has it, 
but the BIOS rarely mentions it, so the Linux driver does not enable 
HPET. Is there any chance to enable HPET (in the chipset?) - this would 
probably be a higher-quality clock-events source than the PIT.

	Ingo
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