Re: [Xen-users] Xen memory allocation for dom0 and domU

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2015-02-04 at 11:16 -0500, Jintack Lim wrote:
> On Wed, Feb 4, 2015 at 9:55 AM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
> > On Wed, 2015-02-04 at 09:45 -0500, Jintack Lim wrote:
> >> > Don't forget that Xen itself will consume some RAM, according to your
> >> > numbers it's something between 256M and 350M on this system (that's more
> >> > than my gut feeling expects, but not way out).
> >> >
> >>
> >> Yes, it seems Xen is consuming 289M.
> >> Is it expected?
> >
> > It's a bit more than my gut feeling would have said we used, but not so
> > large I think it indicates something is very wrong.
> 
> Thanks.
> 
> I also check on the Seattle which has 16G of RAM.
> After I allocated 1536M for the dom0,
> this is what I got.
> total_memory           : 16345
> free_memory            : 14591
> 
> 218M seems to be used for Xen on the Seattle.

Since Seattle is ARM64 and so doesn't have a xen- vs. dom-heap split
this is likely to mostly be the frame table needed for 16G of RAM, which
will be around 200M of RAM.

Ian.


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