linux-kernel - Re: 2.6.27: 0 MHz CPU and wrong system time on AMD Geode system

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Message-ID: <20081020202529.GE21041@cosmic.amd.com>
Date:	Mon, 20 Oct 2008 14:25:29 -0600
From:	Jordan Crouse <jordan.crouse@....com>
To:	Alok Kataria <alokkataria1@...il.com>
CC:	Antipov Dmitry <dmantipov@...dex.ru>, linux-kernel@...r.kernel.org,
	akataria@...are.com
Subject: Re: 2.6.27: 0 MHz CPU and wrong system time on AMD Geode system

On 17/10/08 15:17 -0700, Alok Kataria wrote:
> On Thu, Oct 16, 2008 at 9:48 PM, Antipov Dmitry <dmantipov@...dex.ru> wrote:
> > Jordan Crouse wrote:
> >
> >> Could you try a 2.6.26 kernel? That will confirm that this is a new
> >> addition to 2.6.27.
> >
> > Both 2.6.26 and 2.6.26.6 looks good (with CONFIG_GEODE_MFGPT_TIMER=y).
> 
> Can you try the attached debug patch, it puts a printk message and
> will let us know what exaclty is failing during the calibration
> process.
> There were some major changes in the 2.6.27 cycle related to tsc calibration.
> Apart from the unification for 32 and 64bit, some checks were added in
> the code to make the calibration process more robust, maybe this
> specific machine is more prone to SMI's than other, as a result the
> checks are a little to harsh for this one.
> 
> Along with the dmesg with this patch, could you also let us know how
> much is the frequency that the (2.6.26) kernel calibrates and what the
> actual freuqency is on that box ?

I just booted with 2.6.27.1 with high res timers on, and I can't recreate
on a generic Geode box.  The only difference is that my system doesn't
have any MFGPT timers available, but that shouldn't matter if you have
CONFIG_GEODE_MFGPT_TIMER turned off.

Jordan

-- 
Jordan Crouse
Systems Software Development Engineer 
Advanced Micro Devices, Inc.

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