[Libvir] [PATCH] Xen: Support cpu_weight and cpu_cap for Xen.

beth kon eak at us.ibm.com
Fri Nov 2 15:47:35 UTC 2007

I am not a user, so my feelings here may be incorrect, but it seems it 
might be unpleasant to have to modify 30 (for example) domain configs 
when I'm trying to rework tuning information for a machine. I could 
imagine a single config file that contains cpu_weight, cpu_cap, the 
cpuset, and whatever other tuning information per domain might be 
appropriate. Looking at a single file to tweak such values across 
multiple domains might be preferable, and make the situation easier to 

Jim Fehlig wrote:

> David Lutterkort wrote:
>> On Fri, 2007-10-26 at 09:08 -0400, Daniel Veillard wrote:
>>>   I can understand the need to make it easy for an user, I still don't
>>> think this means those tuning informations need to be associated to the
>>> domain definition, to me it is somehow orthogonal to the domain 
>>> themselves
>>> and I would rather try to provide a good solution to the problem, than
>>> try to imitate how Xen was doing that.
>> Surely, users who set tuning parameters view them as part of their
>> domain description.
> I agree.  It appears the discussions around recent Linux-VServer 
> patches includes tuning information in the XML description so I'm a 
> little confused if this idea is being received positively or not.
> I would like to avoid calling out to some other API for scheduling 
> parameters at domU definition if at all possible.  Perhaps I've been 
> away too long and this functionality already exists :-), but not 
> seeing it in http://www.libvirt.org/format.html
> Regards,
> Jim
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Elizabeth Kon (Beth)
IBM Linux Technology Center
Open Hypervisor Team
email: eak at us.ibm.com

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