From mboxrd@z Thu Jan 1 00:00:00 1970 From: Florian Kirstein Subject: Re: Supported #of CPUs/VMs per CPUs Date: Fri, 22 Sep 2006 02:34:04 +0200 Message-ID: <20060922023404.A22163@web.ray.net> References: <6329630.post@talk.nabble.com> <6362415.post@talk.nabble.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: ; from dunlapg@umich.edu on Mon, Sep 18, 2006 at 09:40:14AM -0400 List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Hi, > There is no maximum number of domains per cpu. The maximum number of > domains *per machine* (regardless of the # of CPUs) depends on the > amount of resources available, mainly memory. > I've never tried to max out the numer if idle domains in Xen, but > in general, the answer is quite a bit. I did try it out (see "maximum Number of DomUs" posting a few months back) on a 16 GB Quad-Opteron, and was surprised hitting a limit way before I used up all my memory, at about 107 DomUs. Xen has a private heap of 16MB and each Domain needs some memory there, so (possibly depending of what else is stored there) at about 100 DomUs that's it. Sure, not a real problem (there are few usefull szenarios in which one would want 100 DomUs on one host), but worth mentioning IMHO... Or did something change in this respect? (:ul8er, r@y