Subject: Re: [RFC][PATCH 2.6] PM Timer as primary timing source on i386
From: john stultz <johnstul@us.ibm.com>
To: Dominik Brodowski <linux@brodo.de>
Cc: lkml <linux-kernel@vger.kernel.org>, arjanv@redhat.com
In-Reply-To: <20030719081407.GA2665@brodo.de>
References: <20030719081407.GA2665@brodo.de>
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Date: 21 Jul 2003 10:35:18 -0700
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On Sat, 2003-07-19 at 01:14, Dominik Brodowski wrote:
> This patch implements support for a different timing source for the i386
> architecture, the Power Management Timer (PMTMR). It offers correct results
> with a ~3.6MHz resolution even during aggressive Powermanagement like ACPI
> C-State transitions, throttling and/or frequency scaling. It is based partly 
> on Arjan's patch for 2.4.

Very cool! I had actually been working on a version of the same thing
bug got stalled on the duplicated ACPI parsing. I like your trick of
having it as a module to avoid the ACPI early boot parsing, but it could
cause problems with alternate time sources. Maybe later in the 2.6/2.7
time frame we can do some sort of delayed registering and time
selection. 

I'll play around with it and let you know if I have any other feedback.

Very nice work!
-john


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