Subject: Re: [2.6.0-mm2] PM timer still has problems
From: john stultz <johnstul@us.ibm.com>
To: Karol Kozimor <sziwan@hell.org.pl>
Cc: lkml <linux-kernel@vger.kernel.org>
In-Reply-To: <20040105221758.GA13727@hell.org.pl>
References: <20031230204831.GA17344@hell.org.pl>
	 <1073340716.15645.96.camel@cog.beaverton.ibm.com>
	 <20040105221758.GA13727@hell.org.pl>
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Date: Mon, 05 Jan 2004 14:32:49 -0800
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On Mon, 2004-01-05 at 14:17, Karol Kozimor wrote:
> Thus wrote john stultz:
> > If the override boot option failed, its most likely your system doesn't
> > have an ACPI PM time source.  Instead it seems your system is having
> 
> Well, I don't have the slightest idea on how to determine this, though I
> read somewhere that all ACPI-compliant systems have those.

More debug output is probably needed. 

> > trouble using the PIT as a time source (which seems not all that
> > uncommon unfortunately). 
> 
> Perhaps, though bear in mind it behaves so only if clock=pmtmr has been
> appended and works fine with clock=pit.

Ah, I must have missed that point. Indeed that is very odd. When booting
without the clock= what time source is used? Does booting w/
"clock=crazy" also show the problem?

> > I guess we can just re-call select_timer() without an override if the
> > override fails, that way you'll fall back to the default time source on
> > your system. Try the (compile tested) patch below and see if that helps.
> 
> That would be PIT again, as TSC is unusable due to CPUFreq.
> I'll try it ASAP -- should I test with Dmitry's patch applied?

No, my patch is just against 2.6.1-rc1 (really I should have checked if
it applies onto mm2, but I didn't). Due to the misunderstanding above,
I'm actually more interested in the questions I just asked then if the
last patch worked (but if you're feeling bored, don't let me stop you
from testing it :)

thanks
-john


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