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Message-ID: <4BFADF9D.9050209@zytor.com>
Date: Mon, 24 May 2010 13:20:45 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: john stultz <johnstul@...ibm.com>
CC: Dan Magenheimer <dan.magenheimer@...cle.com>,
Brian Bloniarz <bmb@...enacr.com>, Ingo Molnar <mingo@...e.hu>,
Thomas Gleixner <tglx@...utronix.de>,
Peter Zijlstra <peterz@...radead.org>,
Andi Kleen <andi@...stfloor.org>,
Arjan van de Ven <arjan@...radead.org>,
Venkatesh Pallipadi <venki@...gle.com>, chris.mason@...cle.com,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: Export tsc related information in sysfs
On 05/24/2010 11:51 AM, john stultz wrote:
>
> Hmmm. That could be an option for newer cpus that I wouldn't oppose.
>
> While Peter is correct that the stamped value is probably not very
> accurate, atleast it would be constant from boot to boot, and NTP's
> calculated drift value would be correct.
>
> We'd need a check to make sure its not way off, since NTP will give up
> if its outside 500ppm. So as long as its close to the calibrated value,
> we probably could use it.
>
Is that still the case? I thought newer versions of NTP could deal with
large values. Inaccuracies of way more than 500 ppm are everyday.
-hpa
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