Messages in this thread | | | Subject | Re: [patch-mm 14/33] x86_64: Consolidate tsc calibration | From | Thomas Gleixner <> | Date | Tue, 17 Jul 2007 17:00:43 +0200 |
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On Tue, 2007-07-17 at 14:51 +0200, Andi Kleen wrote: > On Sunday 15 July 2007 18:10:55 Thomas Gleixner wrote: > > Move the TSC calibration code to tsc.c. Reimplement it so the > > pm timer can be used as a reference as well. > > Why is the pm timer better than the PIT for this? > > I've had mixed success with the pmtimer too.
I had more consistent results on i386 with pmtimer than with the PIT
> > > > Index: linux-2.6.22-rc6-mm/include/asm-i386/tsc.h > > =================================================================== > > --- linux-2.6.22-rc6-mm.orig/include/asm-i386/tsc.h 2007-07-15 17:26:45.000000000 +0200 > > +++ linux-2.6.22-rc6-mm/include/asm-i386/tsc.h 2007-07-15 17:34:42.000000000 +0200 > > @@ -71,4 +71,8 @@ extern void init_tsc_clocksource(void); > > extern void check_tsc_sync_source(int cpu); > > extern void check_tsc_sync_target(void); > > > > +#ifdef CONFIG_X86_64 > > +extern void tsc_calibrate(void); > > +#endif > > The ifdef shouldn't be needed?
Yep. It can go.
tglx
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