linux-kernel - 2.6.18 tsc clocksource + ntp = excessive drift; acpi

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Message-ID: <456CCA54.6090504@gmail.com>
Date:	Tue, 28 Nov 2006 21:46:28 -0200
From:	Alexandre Pereira Nunes <alexandre.nunes@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: 2.6.18 tsc clocksource + ntp = excessive drift; acpi_pm does fine.

Hi,

with default boot I got tsc clocksource selected on an debian's 
2.6.18-3-k7 SMP build (but UP machine). ntp keeps bothering me with this 
message:
frequency error 512 PPM exceeds tolerance 500 PPM

If I remove ntp's drift file and restart, it goes fine for a while and 
then it goes with that behaviour again.
If I remove ntp's drift file, then do a: echo acpi_pm 
 >/sys/devices/system/clocksource/clocksource0/available_clocksource ; 
and then restart ntp, it goes fine "forever".

Any toughs, something I should look at?

I'll be glad to give more feedback.

I don't know if that happened with 2.6.17, but I'm pretty sure that with 
2.6.16 it was fine.

- Alexandre
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