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RE: [Xen-devel] Very poor VMX performance

To: "Khoa Huynh" <khoa@xxxxxxxxxx>, "Casey Jeffery" <kcjeffery@xxxxxxxxx>
Subject: RE: [Xen-devel] Very poor VMX performance
From: "Li, Xin B" <xin.b.li@xxxxxxxxx>
Date: Fri, 10 Feb 2006 23:34:30 +0800
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Thread-topic: [Xen-devel] Very poor VMX performance
 >Casey Jeffery <kcjeffery@xxxxxxxxx> wrote on 02/09/2006 11:52:03 PM:
>> After several days of problems, I finally got Xen 3.0.1 set up in
>> Ubuntu Breezy with the 2.6.12 kernel on a VT-enabled system with an
>> Intel 930 processor and 2GB of memory.
>> I have been able to install an unmodified guest without any issues
>> other than performance. The guest runs extremely slowly and the
>> mouse and keyboard are all but useless because of the extreme lag.
>> I've tried multiple viewers (vncviewer 3.3, 4.0, and tightvnc), as
>> well as low color depths. I am currently using a file-backed image
>> file, as was recommended in the user's manual, but I don't know of
>> any other item that could be causing such poor performance. I don't
>> see anything about this in the archives and am open to any 
>Are you running Xen in x86-64 mode ?  We found that the performance
>of unmodified guests on x86-64 Xen is very slow, mostly in the video

We will reenable the VGA acceleration soon, since 1:1 pagetable has been
removed from control panel.

> However, if you run unmodified guests in pure 32-bit
>Xen (x86-32), then the guest performance is quite acceptable - for
>both Windows and Linux guests.  Some have noticed that the guest
>performance is a bit better using SLD (instead of vnc).  Of course,
>"acceptable" is in the eyes of the beholder :-)
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