linux-kernel - Re: [PATCH] Remove Barcelona Thermal Throttling

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Date:	Mon, 4 Feb 2008 11:22:50 -0800
From:	"Russell Leidich" <rml@...gle.com>
To:	"Andi Kleen" <andi@...stfloor.org>
Cc:	"Torsten Kaiser" <just.for.lkml@...glemail.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Ingo Molnar" <mingo@...e.hu>, valdis.kletnieks@...edu
Subject: Re: [PATCH] Remove Barcelona Thermal Throttling

On Feb 3, 2008 11:20 PM, Andi Kleen <andi@...stfloor.org> wrote:
> On Sun, Feb 03, 2008 at 10:13:53PM -0800, Russell Leidich wrote:
> > All,
> >
> > You can imagine my dismay when I recently learned that, after all our
> > collective effort, hardware thermal throttling does not work reliably
> > on Barcelona, according to AMD.  Due to NDA restrictions, I am unable
> > to provide further details.
>
> Too bad. Hopefully that code will work then on the hypothetic
> future parts with fixed throttling. Perhaps it would be better
> to just remove it now and readd later.

I really think it's best to leave it in.  It's harmless at the moment,
and readding it later will just create a massive amount of duplicate
work.    Sooner or later, I'm have little doubt that AMD can make this
feature work.

>
> All this reminds me you need to adjust the Kconfig dependencies
> for K8_NB too to be always enabled with MCE_AMD.
>
> Ideally on top of this patch with a || MCE_AMD

OK, if you'll take the patch, I'd be happy to do this :).  I'm
assuming that you mean I should force K8_NB = "yes" if MCE_AMD = "yes"
in .config.  Is that what you're asking for?

>
> -Andi
>
> ---
>
> Fix and simplify k8.c Kconfig dependencies
>
> - Check for K8_NUMA instead of NUMA && PCI
> - No need to check for x86_64 explicitely
>
> Signed-off-by: Andi Kleen <ak@...e.de>
>
> Index: linux/arch/x86/Kconfig
> ===================================================================
> --- linux.orig/arch/x86/Kconfig
> +++ linux/arch/x86/Kconfig
> @@ -1540,7 +1540,7 @@ endif # X86_32
>
>  config K8_NB
>         def_bool y
> -       depends on AGP_AMD64 || (X86_64 && (GART_IOMMU || (PCI && NUMA)))
> +       depends on AGP_AMD64 || GART_IOMMU || K8_NUMA
>
>  source "drivers/pcmcia/Kconfig"
>
>



-- 
Russell Leidich
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