Re: [Xen-devel] initial ballooning amount on HVM+PoD

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.01.14 at 17:08, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> On Fri, 2014-01-17 at 16:03 +0000, Jan Beulich wrote:
>> max_pfn/num_physpages isn't that far off for guest with less than
>> 4Gb, the number calculated from the PoD data is a little worse.
> 
> On ARM RAM may not start at 0 and so using max_pfn can be very
> misleading and in practice causes arm to balloon down to 0 as fast as it
> can.

Ugly. Is that only due to the temporary workaround for there not
being an IOMMU?

And short of the initial value needing to be architecture specific -
can you see a calculation that would yield a decent result on ARM
that would also be suitable on x86?

Jan


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