Messages in this thread | | | Date | Mon, 7 Aug 2006 13:09:31 +0200 | From | Vojtech Pavlik <> | Subject | Re: [PATCH] Turn rdmsr, rdtsc into inline functions, clarify names |
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On Mon, Aug 07, 2006 at 10:48:50AM +0200, Andi Kleen wrote: > On Sun, Aug 06, 2006 at 10:43:44PM -0400, Dmitry Torokhov wrote: > > On Saturday 05 August 2006 23:16, Andi Kleen wrote: > > > This whole thing is broken, e.g. on a preemptive kernel when the > > > code can switch CPUs > > > > > > > Would not preempt_disable fix that? > > Partially, but you still have other problems. Please just get rid > of it. Why do we have timer code in the kernel if you then chose > not to use it?
The problem is that gettimeofday() is not always fast. The joystick drivers will not work if the timing calls take significant time compared to an inb() from ISA/LPC space.
That's why they don't fallback to PIT timing when TSC is not available - io counting is a better option.
-- Vojtech Pavlik Director SuSE Labs - 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/
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