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xen-devel
Re: [Xen-devel] Xen cpufreq support status: how to notify hypervisor of
On 11 Apr 2006, at 21:11, Matt T. Yourst wrote:
I'm still getting some issues with the timer not properly re-syncing
even
though the cpufreq driver makes the new setcpufreq hypercall, which Xen
properly receives.
Right now it just sets cpu_khz and calls local_time_calibration() on
the
target CPU(s). Is there something else we need to do, like calling the
equivalent of early_time_init() or init_xen_time() all over again?
The problem is much less severe now but it still sometimes happens.
local_time_calibration() won't really do the right thing. It will
calibrate for the observed TSC rate over the last few seconds, most of
which will have passed at the old TSC rate. The simplest fix would
simply be to multiply the calculated TSC scale factor by
new_mhz/old_mhz.
-- Keir
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