linux-kernel - Re: [PATCH 0/2] AMD ARAT fixes

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Date:	Tue, 17 May 2011 19:21:43 +0200
From:	Jörg-Volker Peetz <jvpeetz@....de>
To:	linux-kernel@...r.kernel.org
Cc:	Nick Bowler <nbowler@...iptictech.com>,
	"Ostrovsky, Boris" <Boris.Ostrovsky@....com>,
	"Herrmann3, Andreas" <Andreas.Herrmann3@....com>,
	Greg Kroah-Hartman <greg@...ah.com>,
	"Rosenfeld, Hans" <Hans.Rosenfeld@....com>,
	X86-ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] AMD ARAT fixes

Borislav Petkov wrote, on 05/17/11 18:53:
> On Tue, May 17, 2011 at 12:38:46PM -0400, Jörg-Volker Peetz wrote:
>> A kernel version 2.6.38.6 patched with your two patches modifying only
>> arch/x86/kernel/cpu/amd.c starts and runs without problems on the affected
>> system with a AMD Turion 64 processor. The system is pure x86_64 (Debian
>> Release: wheezy/sid) with gcc version 4.6.1 20110428 (prerelease) (Debian
>> 4.6.0-6) and GNU C Library (Debian EGLIBC 2.13-4) stable release version 2.13.
> 
> Thanks for testing!
> 
>> The only obvious difference I see is the message "using C1E aware idle routine"
>> in dmesg.
> 
> That was your CPU, right:
> 
> vendor_id       : AuthenticAMD
> cpu family      : 15
> model           : 36
> model name      : AMD Turion(tm) 64 Mobile Technology MT-40
> stepping        : 2
> 
> ?
Yes, exactly.

> 
> If so, then the C1E idle line above shouldn't appear. Can you check that
> around line 698 in <arch/x86/kernel/cpu/amd.c> you have the following:
> 
>  const int amd_erratum_400[] =
>        AMD_OSVW_ERRATUM(1, AMD_MODEL_RANGE(0xf, 0x41, 0x2, 0xff, 0xf),
>                            AMD_MODEL_RANGE(0x10, 0x2, 0x1, 0xff, 0xf));
> 
The lines 683--685 in this file on my affected system are equal to the three
lines above (except for formatting).

> On your machine, you should be using the default_idle routine instead,
> since you don't have C1E.

?

> 
> Thanks.
> 


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