linux-kernel - Re: PROBLEM: Performance drop

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Date:	Wed, 11 Jul 2012 15:06:43 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Jason Vas Dias <jason.vas.dias@...il.com>,
	Matthew Garrett <mjg@...hat.com>,
	Len Brown <len.brown@...el.com>
Cc:	Andreas Herrmann <herrmann.der.user@...glemail.com>,
	Comrade DOS <suloevdmitry@...il.com>,
	linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: Performance drop

On Sat, Jul 07, 2012 at 03:40:58PM +0100, Jason Vas Dias wrote:
> I can confirm that the AMD Turion X2 2.2Ghz  HP Compaq 6715b
> "business" x86_64 k8 dual-core laptops circa 2007
> DO get stuck in 800Khz mode  and cannot switch out of it after booting
> the "stable" "v3.4.4" tagged kernel.
> 
> I followed the containing post and reverted commit
> ff74ae50f01ee67764564815c023c362c87ce18b :
> 
> Commit d51cdad33bb5bb370c05129f7c7f3a16a55eff40
> Author: root <root@...spc.localdomain>
> Date:   Fri Jul 6 18:57:03 2012 +0000
> 
>     Revert "ACPI: Evaluate thermal trip points before reading temperature"
> 
>     This reverts commit 9bcb8118965ab4631a65ee0726e6518f75cda6c5.
> 
> commit ff74ae50f01ee67764564815c023c362c87ce18b
> Author: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Date:   Fri Jun 22 11:37:50 2012 -0700
> 
> And wow !  what a difference - back to a circa 2007 machine versus  a
> circa 1987 machine.
> 
> Not too many of us  left around trying to run the latest version of
> linux on nearly 5-year-old hardware I guess, but still -
> please can you restore correct Linux cpufreq & thermal operation on
> old-style AMD k8 CPUs ?
> They do seem to depend on the temperature being set BEFORE 1st entry .
> 
> Thanks & Regards,
> Jason Vas Dias (a Software Engineer) <jason.vas.dias@...il.com>

Any reason you didn't include the original developers of the
9bcb8118965ab4631a65ee0 patch?

Matthew, Len, any ideas?

greg k-h
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