linux-kernel - Re: Linux 2.6.30-rc8 [also: VIA Support]

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Date:	Tue, 9 Jun 2009 16:14:31 +0800
From:	Harald Welte <HaraldWelte@...tech.com>
To:	"Michael S. Zick" <lkml@...ethan.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Duane Griffin <duaneg@...da.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.30-rc8 [also: VIA Support]

On Sat, Jun 06, 2009 at 07:17:44AM -0500, Michael S. Zick wrote:
> The mainstream kernel, e_powersaver, is *under-clocking* my machine -
> 
> The cpuid instruction provides the minimum and maximum GSF values 
> (Guaranteed Stable Frequency) for that processor mask run -
> Passing that on as the lower and upper limits to e_powersaver should
> stop that problem.  Will be testing this RSN.

Can you provide more information on where you think you are getting the GSF
values from?  I am not aware of such information.

The internal documentation always only refres to the minimum VID/FID values
from the MSR.  Also, according to the specifications of all C7 models listed,
there are some that require a minimum of 400MHz, others require a minimum of
800.  I have not found any that would require a minimum of 600MHz.

So I don't really know if your system really operates outside any specified
range.

The only thing I know of that you can read from the CPUID vendor string is
the maximum clock frequency in ASCII.

So it seems, e_powersaver is not really at all as dangerous as it appeared!

-- 
- Harald Welte <HaraldWelte@...tech.com>	    http://linux.via.com.tw/
============================================================================
VIA Free and Open Source Software Liaison
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