Re: Xen cpu usage limting

[Rolf Neugebauer <rolf.neugebauer@intel.com>]

Hi Brian,

which version of Xen/Xenolinux are you using? the scheduler
implementation changed from 1.2 to 1.3-unstable.

On Fri, 2004-04-16 at 17:40, Brian Wolfe wrote:
> Is it possible? How? (looked for documentation, but I didn't see any.)
> I did see xen_cpuperf, but I can't get any real information from there
> either. 8-(
> 
> I have 8 domains (including domain-0) runing on the server. If one goes to
> 100% cpu time, the system bogs. I'd like to be able to ensure that each
> instance can't keep the rest from runing...

This should definitely not happen!!! Could you provide a little more
detail on what is running in the different domains? 

In 1.2 the scheduler is a weighted proportional share scheduler (BVT)
and by default all domains get the same weight and therefore should get
the same share.

in 1.3 you have a boot-time choice between schedulers, BVT (same as in
1.2, Atropos (a soft real time scheduler based on EDF)

I have just tested with 1.3-unstable, four domains on a dual processor
machine (two domains per CPU) and BVT as the scheduler and they happily
share the CPU 50/50 if both run the equivalent of a while(1) loop.

Rolf





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