RE: [Xen-devel] [PATCH] linux/balloon: don't allow ballooningdowna domain below a reasonable limit

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

>>> "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> 29.04.08 20:35 >>>
>I made some actual measurements of the results of this algorithm
>(on a RHEL5u1-32bit guest).
>
>memory=        Minimum
>128             75776kB
>256            108544kB
>512            173056kB
>1024           238592kB
>
>This corresponds to expected values in the source comment
>However, I wonder if the algorithm is probably too
>conservative for large(r) memory domains.  With
>a light load (i.e. continuously compiling Xen),
>memory utilization rarely exceeds 72MB, regardless
>of the max memory (at least in the above tested values).

Sure, this was (in different wording) also stated in the comment
that came with the patch. A more precise estimate would certainly
be welcome, but I'm afraid is going to come with a much higher
(complexity) price tag. Unless you have something simple and
obvious in mind that we simply didn't spot...

Jan


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