linux-kernel - Re: AMD X2 unsynced TSC fix?

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Message-ID: <45427E91.2000402@nortel.com>
Date:	Fri, 27 Oct 2006 15:48:01 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Lee Revell <rlrevell@...-job.com>
CC:	Andi Kleen <ak@...e.de>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	john stultz <johnstul@...ibm.com>
Subject: Re: AMD X2 unsynced TSC fix?

Lee Revell wrote:

> What exactly does that AMD patch do?

"...by periodically adjusting the core time-stamp-counters, so that they 
are synchronized."

It sounds like they just periodically write a new value to the TSC. 
Presumably they set the "slower" one equal to the "faster" one.

You'd likely still have windows where time might run backwards, but it 
would be better than nothing.

Chris
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