Re: [Xen-devel] Xen cpufreq support status: how to notify hypervisor of frequency change?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 13 Apr 2006, at 03:31, Matt T. Yourst wrote:

> Doesn't set_time_scale() do exactly this by directly using the supplied
> ticks_per_sec value? Why does it need to be scaled based on the old 
> frequency
> when the values can just be recalculated?
>
> I removed the call to local_time_calibration() and it still works just 
> fine,
> so it looks like set_time_scale() overrides the other settings anyway.
Ah yes, looking closer at your code I think you are doing the right 
thing and the local_time_calibration() call should be removed.
> I'm still having a strange issue (only in X sessions it appears) where 
> the key
> repeat rate and response time gets very slow after a frequency shift.
> Everything else responds normally except for the keyboard, and that 
> problem
> goes away after a minute or two. Any idea what's going on?
Any idea if fiddling with CPU frequency affects the local APIC bus 
frequency? I would guess probably not...
Do you really mean the problem continues for a few *minutes* before 
'fixing itself'?
 -- Keir


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