From: "George Spelvin" <linux@horizon.com>
To: johnstul@us.ibm.com, linux@horizon.com
Cc: linux-kernel@vger.kernel.org, tglx@linutronix.de,
ulrich.windl@rz.uni-regensburg.de, williams@redhat.com,
zippel@linux-m68k.org
Subject: Re: [RFC][PATCH] Adjust SHIFT_PLL to improve NTP convergence.
Date: 7 May 2009 02:07:41 -0400 [thread overview]
Message-ID: <20090507060741.26571.qmail@science.horizon.com> (raw)
In-Reply-To: <1241624640.9110.3.camel@jstultz-laptop>
> Yea. The TSC calibration issue has been around for awhile. Although the
> code has been tweaked recently, I'm not seeing that much improved
> consistency from reboot to reboot.
>
> Its a hard trade off for folks who need very quick boot time, vs folks
> that want very stable and accurate clocks across reboots.
>
> I'll be looking into the calibration code to see how much is needed to
> bring the error rate down.
The fast estimate is very good. Would it be possible to do a fine
calibration in parallel with the rest of the boot sequence? Maybe until
the first adjtimex call? Or is it essential that the numbers not
change?
next prev parent reply other threads:[~2009-05-07 6:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-04 21:03 [RFC][PATCH] Adjust SHIFT_PLL to improve NTP convergence john stultz
2009-05-05 0:27 ` Rik van Riel
2009-05-06 14:46 ` George Spelvin
2009-05-06 15:44 ` John Stultz
2009-05-07 6:07 ` George Spelvin [this message]
2009-05-07 9:14 ` Ulrich Windl
2009-05-07 18:07 ` George Spelvin
2009-05-07 19:37 ` john stultz
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