From: Jamie Lokier <lk@tantalophile.demon.co.uk>
To: Jim Houston <jim.houston@attbi.com>
Cc: linux-kernel@vger.kernel.org,
high-res-timers-discourse@lists.sourceforge.net,
jim.houston@ccur.com
Subject: Re: [PATCH] improved boot time TSC synchronization
Date: Thu, 16 Jan 2003 21:33:32 +0000 [thread overview]
Message-ID: <20030116213332.GA14040@bjl1.asuk.net> (raw)
In-Reply-To: <200301161644.h0GGitX02052@linux.local>
Jim Houston wrote:
> + * t0 ---\
> + * ---\
> + * --->
> + * tm
> + * /---
> + * /---
> + * t1 <---
> + *
> + *
> + * The goal is to adjust the slave's TSC such that tm falls exactly half-way
> + * between t0 and t1.
It looks like not only can you synchronise with a certain accuracy,
you can determine an upper bound on that accuracy (assuming the
underlying CPU clocks are locked).
Maybe that figure could be put into /proc/cpuinfo?
As well as being an interesting value, it may be useful for programs
to know the effective accuracy of `rdtsc'.
-- Jamie
next prev parent reply other threads:[~2003-01-16 21:25 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-01-16 16:44 [PATCH] improved boot time TSC synchronization Jim Houston
2003-01-16 17:54 ` David Mosberger
2003-01-16 21:33 ` Jamie Lokier [this message]
2003-01-17 0:34 ` Jim Houston
2003-01-17 1:00 ` Jamie Lokier
2003-01-17 3:35 ` Jim Houston
-- strict thread matches above, loose matches on Subject: below --
2003-01-21 1:21 Jim Houston
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