linux-kernel - Re: [PATCH] x86: Export tsc related information in sysfs

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Message-ID: <4BFB14BE.8070407@zytor.com>
Date:	Mon, 24 May 2010 17:07:26 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Dan Magenheimer <dan.magenheimer@...cle.com>
CC:	john stultz <johnstul@...ibm.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 05:01 PM, Dan Magenheimer wrote:
> On a quick sample of two machines looking at the TSC calibration
> done by Xen (which exposes the equivalent of tsc_khz), it appears
> that the stamped value is different from the calibration by about
> 1000ppm.  YMMV.

So pretty seriously different.  Less than I would have expected, but not
out of the ballpark.

	-hpa
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