On Tue, 2007-04-17 at 10:09 -0700, Andrew Morton wrote:
> I guess this counts as a regression.
>
> Begin forwarded message:
>
> Date: Tue, 17 Apr 2007 14:16:25 +0200 (MEST)
> From: Mikael Pettersson
> To: [email protected]
> Subject: [BUG 2.6.21-rc7] acpi_pm clocksource loses time on x86-64
>
>
> The machine is an old Athlon64 laptop (Targa Visionary 811,
> OEMd as the Arima W720-K8, also sold as the eMachines m6805)
> with a VIA K8T800 chipset. ACPI is enabled.
>
> Up to kernel 2.6.20, time-keeping worked fine. In the
> x86-64 kernel, the clock source is listed as "jiffies".
>
> With current 2.6.21-rc7, the x86-64 kernel selects
> acpi_pm as its clock source. Unfortunately, with this
> clock time drifts and it loses several minutes per hour.
>
> What's strange is that the i386 kernel on the same
> machine (with similar .config) does not lose time
> while using the acpi_pm clock source.
Huh. Quite strange as its the same acpi_pm clocksource driver!
The only difference I see right off is that verify_pmtmr_rate() isn't
done on x86_64. Although I'd expect you'd see "PM-Timer running at
invalid rate" w/ the i386 kernel if it made a difference.
Could you send me the dmesg output for both the x86_64 and i386 kernels
you tried?
thanks
-john
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
