Re: [Xen-devel] how much memory does xen itself need?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 28 Apr 2005, at 00:50, Chris Wedgwood wrote:

> On Wed, Apr 27, 2005 at 04:30:58PM +0100, Keir Fraser wrote:
>
> > Xen will take 40MB. The rest is available for domains
> > (inc. domain0).
> Hmm... this has increased over time.  Is there a breakdown of what the
> 40MB is used for?
This is only for a 4GB system. The breakdown is:
4MB: machine_to_phys table
12MB: Xen heap
24MB: frame_info for 4GB RAM

If you have x gigabytes RAM, 32-bit non-PAE Xen will require (16+6x)MB.

I think you can also reduce Xen's heap size -- I added a boot-time 
option but it isn't very tested.
 -- Keir


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