Re: [Xen-devel] HVM and free_memory query

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 10/07/2009 19:33, "Apoorva Kulkarni" <apoorva@xxxxxxxxx> wrote:

> Thank you for your quick response. That helps a lot.
> 
> In our case we need to know precisely how much overhead memory is
> required by xen per domain. So is it okay for us to assume that it will
> always be under 0.8% or could there be exceptions to this (e.g.
> different fractions for a Solaris 10 HVM vs Windows HVM) ?

Precisely, the overhead is determined by xend as: 8kB per 1MB of guest
memory, plus 1MB per guest virtual cpu.

See xen/xend/image.py:X86_HVM_ImageHandler:getRequiredShadowMemory()

 -- Keir



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