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Re: [Xen-devel] [PATCH 08 of 10 v3] libxl: enable automatic placement of guests on NUMA nodes

On Fri, 2012-07-06 at 11:55 +0100, Ian Campbell wrote: 
> > Once we know which ones, among all the possible combinations, represents 
> > valid
> > placement candidates for a domain, use some heuistics for deciding which is 
> > the
> > best. For instance, smaller candidates are considered to be better, both 
> > from
> > the domain's point of view (fewer memory spreading among nodes) and from the
> > system as a whole point of view (fewer memoy fragmentation).  In case of
> > candidates of equal sizes (i.e., with the same number of nodes), the amount 
> > of
> > free memory and the number of domain already assigned to their nodes are
> > considered. Very often, candidates with greater amount of memory are the one
> > we wants, as this is also good for keeping memory fragmentation under 
> > control.
> > However, if the difference in how much free memory two candidates have, the
> > number of assigned domains might be what decides which candidate wins.
> I can't parse this last sentence. Are there some words missing after
> "how much free memory two candidates have"?
Ok, I see. What about something like the below:

"However, if the amount of free memory of two candidates is very
similar, we look at how many domains are assigned to each candidate, and
take the one that has fewer of them."

> If you want to post the corrected text I think we can fold it in while
> applying rather than reposting (assuming no other reason to repost crops
> up).
Let's see... I'm fine either way...

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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