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

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Message-Id: <200611140134.21054.len.brown@intel.com>
Date:	Tue, 14 Nov 2006 01:34:20 -0500
From:	Len Brown <len.brown@...el.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Len Brown <lenb@...nel.org>,
	Andreas Mohr <andi@...x01.fht-esslingen.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, venkatesh.pallipadi@...el.com
Subject: Re: CONFIG_NO_HZ: missed ticks, stall (keyb IRQ required) [2.6.18-rc4-mm1]

On Tuesday 07 November 2006 03:07, Ingo Molnar 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.

If Windows enumerates and uses the HPET on a box, then Linux
should be able to use the HPET on that box too.

I belive that Venki has looked at some of the HPET enumeration issues,
and maybe he has some suggestions.  Is there an example system
on-hand where we know Windows works and Linux does not?

-Len
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