From: Ethan Blanton <eblanton@cs.ohiou.edu>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linuxppc-dev@lists.linuxppc.org
Subject: Re: Clock drift on an iBook2
Date: Tue, 17 Jul 2001 13:32:05 -0400 [thread overview]
Message-ID: <20010717133205.A22391@localhost.localdomain> (raw)
In-Reply-To: <20010717165231.25195@smtp.adsl.oleane.com>; from benh@kernel.crashing.org on Tue, Jul 17, 2001 at 06:52:31PM +0200
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Benjamin Herrenschmidt spake unto us the following wisdom:
> Something else you can try: in arch/ppc/kernel/pmac_time.c, comment
> out the call to via_calibrate_decr() (and the return too) so that
> we use the device-tree "timebase-frequency" instead, and tell us if
> it makes any difference.
That seems to have improved it *greatly*. I know have a drift (only
sampled after a few minutes, so somewhat inaccurate -- but accurate
enough to tell that it's no longer seconds/minute) more on a par with
what I have come to expect.
Ethan
--
If I've told you once, I've told you once
And once is all that you needed.
-- The Refreshments, "Carefree"
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next prev parent reply other threads:[~2001-07-17 17:32 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-17 14:27 Clock drift on an iBook2 Ethan Blanton
2001-07-17 16:50 ` Benjamin Herrenschmidt
2001-07-17 16:52 ` Benjamin Herrenschmidt
2001-07-17 17:32 ` Ethan Blanton [this message]
2001-07-17 17:04 ` Ethan Blanton
2001-07-17 17:14 ` Tom Rini
2001-07-17 17:16 ` Ethan Blanton
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