On Fri, Feb 09, 2007 at 11:06:06PM +1100, Rusty Russell wrote:

On Fri, 2007-02-09 at 10:32 +0100, Andi Kleen wrote:

quoted

On Friday 09 February 2007 10:15, Rusty Russell wrote:

quoted

tsc_khz:
	Simplest way of telling the guest how to interpret the TSC
	counter.

Are you sure this will work with varying TSC frequencies? 

I'm actually quite sure it doesn't (there's a FIXME in the lguest code).
Given the debate over how useful the TSC was, I originally didn't use
it, but (1) it's simple, and (2) when it doesn't change, it's pretty
accurate.

But when it changes users become pretty unhappy

quoted

In general you should get this from cpufreq.

Hmm, ok, I'll bite: how?  Time is a mystery I've avoided so far 8)

the old x86-64 time.c (before -mm) has a example in #ifdef CONFIG_CPUFREQ


-Andi