[Xen-devel] Re: [patch 14/21] Xen-paravirt: Add XEN config options and disable unsupported config options.

[Jeremy Fitzhardinge <jeremy@xxxxxxxx>]

Dan Hecht wrote:
> On 02/15/2007 11:04 PM, Jeremy Fitzhardinge wrote:
>> HZ - I'm assuming dynticks will appear in the short term, and this will
>> become moot
>
> Doesn't Xen send any non-blocked domain a 100hz alarm implicitly,
> without anyway for the guest to disable it?  I guess you'll have to
> break kernel/hypervisor compatibility if you want dynticks? 

The timer VIRQ will generate events at a fixed 100Hz (which can be
masked, like any other event), but you can also ask for a timer event at
a particular time.  We do this already for tickless idle.

    J

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