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


RE: [Xen-devel] dom0 starves guests off CPU

To: James Harper <james.harper@xxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] dom0 starves guests off CPU
From: Rik van Riel <riel@xxxxxxxxxx>
Date: Mon, 20 Feb 2006 19:06:45 -0500 (EST)
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
Delivery-date: Tue, 21 Feb 2006 00:19:56 +0000
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <AEC6C66638C05B468B556EA548C1A77DAF0942@trantor>
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>
References: <AEC6C66638C05B468B556EA548C1A77DAF0942@trantor>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
On Tue, 21 Feb 2006, James Harper wrote:

> I found this too when doing a compile in dom0. Search the archives for a
> thread titled 'Performance problems' from January this year.


> At a guess, the default scheduling assumes that all of dom0's work is 
> going to be related to serving data (block and network) to domU's, so it 
> makes sense to give it priority.

That's not a safe assumption.  People will be running CPU
intensive things in dom0, if only things like apt-get, yum
or recompiling a new package after a security bug was found.

Also, some people will want to use dom0 as their desktop,
with a few guest domains as test machines...

I believe that the default should be safe, even if it's not
the most high performance setting for some configurations.

All Rights Reversed

Xen-devel mailing list

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