linux-kernel - Re: [PATCH] x86, TSC: Add a software TSC offset

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Date:	Tue, 22 Jul 2014 10:00:16 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>, x86-ml <x86@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH] x86, TSC: Add a software TSC offset

On Mon, Jul 21, 2014 at 03:13:33PM -0700, Andy Lutomirski wrote:
> >> I actually own one of these systems.  It's a Sandy Bridge Core-i7
> >> Extreme or something like that.
> >
> > Ha, cool, so I've got my tester! :-)
> 
> Ha.  Ha ha.  Muahaha.  Because IIRC this box is synced until the first
> time it suspends.

Oh cute, one of those :-) Yes some BIOSes write 'random' crap into the
TSC when doing the S states jig. We have some tsc suspend/resume hooks
to correct the worst of that, but yeah screwy that.
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