linux-kernel - Re: [PATCH 1/2] x86: AMD: mark TSC unstable on APU family 15h models 10h-1fh

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Message-ID: <20140731154747.GA7160@pd.tnic>
Date:	Thu, 31 Jul 2014 17:47:47 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Igor Mammedov <imammedo@...hat.com>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org, hpa@...or.com,
	mingo@...hat.com, tglx@...utronix.de, pbonzini@...hat.com,
	kvm@...r.kernel.org, mtosatti@...hat.com
Subject: Re: [PATCH 1/2] x86: AMD: mark TSC unstable on APU family 15h models
 10h-1fh

On Thu, Jul 31, 2014 at 09:47:12AM +0000, Igor Mammedov wrote:
> Due to erratum #778 from
> "Revision Guide for AMD Family 15h Models 10h-1Fh Processors,
>  Publication # 48931, Issue Date: May 2013, Revision: 3.10"
> 
> TSC on affected processor, a core may drift under certain conditions,
> which makes initially synchronized TSCs to become unsynchronized.

Is this something you're seeing on a real system? If so, how do you
trigger this?

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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