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: linux-kernel@vger.kernel.org > 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/
