Messages in this thread | | | Date | Wed, 26 Sep 2007 10:31:07 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH] x86-64: Disable local APIC timer use on AMD systems with C1E |
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* Rafael J. Wysocki <rjw@sisk.pl> wrote:
> On Tuesday, 25 September 2007 22:55, Thomas Gleixner wrote: > > On Tue, 2007-09-25 at 22:55 +0200, Rafael J. Wysocki wrote: > > > I have reworked the patch a bit so that it applies on top of 2.6.23-rc8-mm1 > > > and compiles (my version is attached). > > > > > > With this patch applied, the kernel boots correctly on the nx6325. > > > > I know. It's basically enforced "noapictimer". > > > > But this still does not explain why your nasty box booted current > > mainline with "apicmaintimer" on the kernel command line. > > Now it doesn't do that any more. > > As I wrote in the other thread, I think that _sometimes_ the CPU > doesn't enter the C1E state (or how it's called) and then the box > boots and works.
Can you see any correlation between being on AC or on battery and this bug occuring? Sometimes the BIOS might even do C states depending on whether the box was booted up on AC or on battery. (and sometimes the kernel calibrates things differently when booting up on battery [lower speed] - so this can have an effect too.)
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