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

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2014-01-17 at 14:33 +0000, Jan Beulich wrote:
> Interestingly, (a) too results in the driver not ballooning down
> enough - there's a gap of exactly as many pages as are marked
> reserved below the 1Mb boundary. Therefore aforementioned
> upstream commit is presumably broken.

Can we count those reserved pages? (I guess you mean reserved in the
e820?)

> Short of a reliable (and ideally architecture independent) way of
> knowing the necessary adjustment value, the next best solution
> (not ballooning down too little, but also not ballooning down much
> more than necessary) turns out to be using the minimum of (b)
> and (c): When the domain only has memory below 4Gb, (b) is
> more precise, whereas in the other cases (c) gets closest.

I think I'd prefer an arch specific calculation (or an arch specific
adjustment to a generic calculation) to either of the above.

Ian.


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