This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


[Xen-devel] Available Memory on 4GB system

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] Available Memory on 4GB system
From: Peter <p.spamcatcher@xxxxxxxxxxxxxxx>
Date: Fri, 29 Jul 2005 13:55:32 +1200
Delivery-date: Fri, 29 Jul 2005 08:53:20 +0000
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/cgi-bin/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
User-agent: Mozilla Thunderbird 1.0.6-1.1.fc4 (X11/20050720)
We have a dual Xeon server with 4x1GB memory sticks. With a non-Xen kernel it boots up with ~4GB of memory. With the Xen kernel it boots up with ~3.3GB of memory.

I know this has been discussed before, but I'm still not clear why the xen kernel boots up with less memory available than a regular Linux kernel. Would someone mind patiently explaining it once more?

I want to make sure there is no kernel .config option we're setting which is making memory unavailable to us. And from what I read the pae changes in 3.0 should allow us to see more (all?) of the memory.

(BTW we are now offering Xen based VPS hosting - having been running UML based servers up to now. We find the 2.0.6 setup performs well, and the VPSs have been very stable. Other than the minor gripe about the memory, we have been very happy with the software. Thanks for everyone's work on this.)

Regards, Peter

Xen-devel mailing list

<Prev in Thread] Current Thread [Next in Thread>