WARNING - OLD ARCHIVES

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/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

RE: [Xen-devel] Poor HVM performance with 8 vcpus

To: James Harper <james.harper@xxxxxxxxxxxxxxxx>, Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] Poor HVM performance with 8 vcpus
From: Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>
Date: Wed, 7 Oct 2009 09:13:14 +0100
Accept-language: en-US
Acceptlanguage: en-US
Cc: Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>
Delivery-date: Wed, 07 Oct 2009 01:13:47 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <AEC6C66638C05B468B556EA548C1A77D0177D81F@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/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <4ACC3B49.4060500@xxxxxxxxxxxxxx> <4FA716B1526C7C4DB0375C6DADBC4EA342A68E5C92@xxxxxxxxxxxxxxxxxxxxxxxxx> <AEC6C66638C05B468B556EA548C1A77D0177D81F@trantor>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
Thread-index: AcpHG0XK5xmB8kD/RKuruKf1efbf0QABvKHgAACjVMAAADmOEA==
Thread-topic: [Xen-devel] Poor HVM performance with 8 vcpus
 
> Are there any other of these heuristics tucked away in xen? Would there
> be any benefit to specifying the OS being virtualised in the config? Eg
> "os=windows"?

That's really the only one that springs to mind.

Given how simple a predictor would be, I think that's the best approach.

Setting the OS in the config file is a little tricky as in a couple of 
instances you'd want to know the exact version (linux moved the 64b direct 
mapped region at some point during 2.6 development).

Ian

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel