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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 8 Apr 2006, at 23:29, Matt T. Yourst wrote:

> This appears to happen because virtual timer interrupts do not get 
> delivered
> on a regular basis for a few seconds following the frequency change.
>
> Assuming we want to keep the cpufreq driver itself in dom0, what's the 
> proper
> way to notify the hypervisor that the CPU frequency has just changed, 
> so it
> can adjust its timers like the cpufreq driver on the native kernel 
> does?
> I'd really like to have cpufreq working properly under Xen (for both
> workstations and to a lesser extent servers), so what would be the 
> best way
> to get this running?
The TSC needs recalibrating on the affected CPU. This will require 
adapting local_time_calibration() in arch/x86/time.c.
 -- Keir


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