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

from [Keir Fraser] [Permanent Link][Original]
To: Chris Wedgwood <cw@xxxxxxxx>
Subject: Re: [Xen-devel] how much memory does xen itself need?
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Thu, 28 Apr 2005 09:24:38 +0100
Cc: Kip Macy <kip.macy@xxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>
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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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