2.6.18 tsc clocksource + ntp = excessive drift; acpi_pm does fine.

[Alexandre Pereira Nunes <alexandre.nunes@gmail.com>]

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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/