linux-kernel - Re: [git pull?] clocksource: ACPI pmtmr bugfixes [Was: Re: ACPI PM-Timer on K6-3 SiS5591: Houston...]

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Date:	Mon, 18 Aug 2008 22:00:17 +0200
From:	Andreas Mohr <andi@...as.de>
To:	Dominik Brodowski <linux@...inikbrodowski.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	johnstul@...ibm.com, hirofumi@...l.parknet.co.jp,
	alan@...rguk.ukuu.org.uk, arjan@...radead.org, andi@...as.de
Subject: Re: [git pull?] clocksource: ACPI pmtmr bugfixes [Was: Re: ACPI
	PM-Timer on K6-3 SiS5591: Houston...]

Hi,

On Mon, Aug 18, 2008 at 09:35:17PM +0200, Dominik Brodowski wrote:
> Hi Andrew,
> 
> On Mon, Aug 18, 2008 at 12:19:24PM -0700, Andrew Morton wrote:
> > :     acpi_pm.c: check for monotonicity
> > :     
> > :     Expand the check for monotonicity by doing ten tests instead of one.
> > 
> > Why?
> 
> Indeed: http://lkml.org/lkml/2008/8/10/77 -- quote:
> "Result: catastrophic timer behaviour (a large backwards skip is possible),"
> 
> The current check for monotonicity is way too weak. And at least on one
> system out there PMTMR is unuseable, but the current check fails.

Just want to say thank you for promptly following up on this issue!

I wanted to test your 2nd patch (improved init), but was unable to do so
(currently too busy due to large changes, plus distance to production system,
downtime NOT appreciated ;).

Andreas Mohr
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