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Re: [Xen-devel] [PATCH] xl: introduce specific VCPU to PCPU mapping in config file

On Mon, 2012-05-14 at 09:14 +0100, Ian Campbell wrote:
> > Damn! I forgot to update the doc (xl manual) accordingly!
> That was going to be my first comment ;-)

> It would also be useful if the commit message mentions the impact on the
> existing syntax -- I'm not sure if this is changing the behaviour of an
> existing xl syntax or adding a whole new one (maybe the docs will answer
> that).
From since when I added the `cpus=xxx` support to xl (back in February
and righ because it was a missing feature wrt to xm) it was using both:

cpus="2, 3"


cpus=["2", "3"]

to do the same thing, i.e., bind all the vcpus of the guest to the pcpus
#2 and #3 of the host.

On the other hand xm/xend do/did the following:

cpus="2, 3" --> bind all vcpus to pcpus #2 and #3

cpus=["2", "3"] --> bind vcpu #0 to pcpu #3 and vcpu #1 to pcpu #3

So, yes and no. :-) The point is using both syntax for he same thing in
xl hasn't been a good choice at all at that time, and this changest is
fixing that, other than improving xl-xm compatibility.

I hope I've clarified that here, and yes, I'll add something about this
in the commit message.

Thanks and Regards,

<<This happens because I choose it to happen!>> (Raistlin Majere)
Dario Faggioli, Ph.D, http://retis.sssup.it/people/faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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