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

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Date:	Fri, 17 Oct 2008 15:17:39 -0700
From:	"Alok Kataria" <alokkataria1@...il.com>
To:	"Antipov Dmitry" <dmantipov@...dex.ru>
Cc:	linux-kernel@...r.kernel.org,
	"Jordan Crouse" <jordan.crouse@....com>, akataria@...are.com
Subject: Re: 2.6.27: 0 MHz CPU and wrong system time on AMD Geode system

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 ?

Thanks,
Alok
>
> Dmitry
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View attachment "debug_tsc_calibrate.patch" of type "text/x-patch" (410 bytes)