Re: Clock drift on an iBook2

Benjamin Herrenschmidt spake unto us the following wisdom:

quoted

I have a new iBook2 and I'm having *severe* clock drift problems -- on
the order of several seconds gained per minute.  I'd like to get this
taken care of, and it seems to be a linux problem as OSX appears to
have a stable clock.

Are you using MOL or do you experience this with nothing special running ?

Nothing special...   I tried using ntpd to fix the problem, but it
didn't seem to be able to set the system time and I'm not sure why.

Do you have the same issue if you disable powersave_nap (/proc/sys/
kernel/powersave_nap) ?

Yes, it seems to make no difference.  (~4s of drift in 3 minutes
either way, according to the tests I just did)

The TB is calibrated using the VIA, if we don't have a correct VIA frequency
or if the calibration routine is slightly off, that may also explain the
problem.

Looking into your next email regarding the VIA...
Ethan

-- 
If I've told you once, I've told you once
And once is all that you needed.
		-- The Refreshments, "Carefree"

On Tue, Jul 17, 2001 at 01:04:25PM -0400, Ethan Blanton wrote:

Benjamin Herrenschmidt spake unto us the following wisdom:

quoted

quoted

I have a new iBook2 and I'm having *severe* clock drift problems -- on
the order of several seconds gained per minute.  I'd like to get this
taken care of, and it seems to be a linux problem as OSX appears to
have a stable clock.

Are you using MOL or do you experience this with nothing special running ?

Nothing special...   I tried using ntpd to fix the problem, but it
didn't seem to be able to set the system time and I'm not sure why.

Does your kernel have CONFIG_PPC_RTC enabled? (_not_ CONFIG_RTC).

--
Tom Rini (TR1265)
http://gate.crashing.org/~trini/

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