linux-kernel - Re: [RFC][PATCH] tsc_khz= boot option to avoid TSC calibration variance

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Message-ID: <20090511065424.25138.qmail@science.horizon.com>
Date:	11 May 2009 02:54:24 -0400
From:	"George Spelvin" <linux@...izon.com>
To:	johnstul@...ibm.com, linux@...izon.com
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, tglx@...utronix.de,
	ulrich.windl@...uni-regensburg.de, williams@...hat.com,
	zippel@...ux-m68k.org
Subject: Re: [RFC][PATCH] tsc_khz= boot option to avoid TSC calibration variance

Just as a data point, I have this patch running on two PPS-synced
NTP servers with apparent success.  After thinking through the sign
conventions carefully, (if NTP reports a that it is applying a positive
clock frequency adjustment, the TSC frequency should be reduced by that
amount), I now have the NTP frequency offset within a couple PPM of 0.

Thanks for the patch!
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