Re: [Xen-devel] Xen compatibility interface numbering

[Grzegorz Milos <gm281@xxxxxxxxxxxxxxxx>]

> >> Can I run a 2.4 domU against a 2.6 dom0 and vice-versa,
> >> if both are patched to the same level of Xen?
> >
> > Yes. You can play with this on the Demo CD.
>
> How does that work when dom0 is 100 Hz 2.4 kernel and domU is 1000 Hz
> 2.6 kernel?

I will answer this question, although there might be better people to explain 
this.
The scheduling code in both 2.4 and 2.6 kernels relay on hardware timer (to 
interrupt with 100 or 1000 Hz frequency). But the timers had to be 
virtualised, and therefore the parts of the code responsible for scheduling 
patched up as well. This way both linux kernels can work just fine. 
(BTW remember that Xen also has a scheduler which decides which domain should 
be run, but then the domains have freedom of scheduling their own processes).

Cheers
Gregor

>
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