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RE: [Xen-devel] How much memory does a domain REALLY use...

  • To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Graham, Simon" <Simon.Graham@xxxxxxxxxxx>
  • Date: Sat, 24 Feb 2007 14:14:17 -0500
  • Delivery-date: Sat, 24 Feb 2007 11:13:55 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcdXsilmiwy4S98FTPqiaqV0JXsxkgAQHcfAAAqZ8FAAAHkC6QAJotZw
  • Thread-topic: [Xen-devel] How much memory does a domain REALLY use...

> > I'm using xenstat and looking at the difference between total memory
> and
> > free memory (which is in turn obtained from avail_domheap_pages via
> > xc_physinfo... Hmm - does this mean the free memory in the xen heap
> zone
> > is not included? Seems like this is pretty small though (8MB
> total???)
> 12MB on i386; 16MB on x86/64. Either way it's much less than 100+ MB.
> How much memory does the machine have?

Hmm - it does indeed seem to be somewhat dependent on the size of the
machine; I have a bunch of systems from 2GB to 16GB all of which are
running a 768MB Dom0 currently; here's what I see for used memory
(total/free as reported by xenstat) for some of these when just Dom0 is

. 2GB system; 794MB used
. 6GB system; 830MB used
. 8GB system; 840MB used
. 16GB system; 890MB used


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