RE: [Xen-users] Debian/Xen usage summary

["Larry A Weidig" <lweidig@xxxxxxxxx>]

Didier:
        I am using Fedora Core 6 (2.6.18 kernl, 2.6.20 buggy) with Xen
3.0.3 and have a x86_64 Dom0.  Currently we are only running fully
virtualized guests so I cannot comment on the paravirtualization.  We
have run into both the same issues that you are experiencing.  Only 32
bit guests (which in our case is fine) and only type=ioemu for the
network card.  We have found network performance to be on the low end as
well in these guests and have yet to find a solution.  
        One thing I noticed staying with the network issue is that while
Dom0 is a Gigabit Ethernet device and recognized properly, the DomU
machines are only being setup as 100 Mbit Ethernet devices.  Is there a
way to get a gigabit card in the DomU that anybody knows for an HVM
guest?  What about any tricks for optimizing performance? 
        Finally, working with LVM images I can help as we have needed to
do that as well.  There is a good article at:
        
http://www.campworld.net/thewiki/pmwiki.php/Linux/DiskImagesHOWTO
         Sorry, I could not help with the other items, hopefully
somebody else on the list will have more information for us.

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Didier
Trosset
Sent: Friday, April 27, 2007 8:56 AM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Debian/Xen usage summary

Hello,

I just setup a few virtual systems, and I came into some limitations
using 
XEN. I'd like to share these, just to know if the limitations are in the

system or in the user :)

I am using a standard Debian 4.0 (etch) GNU/Linux distribiution. The
system 
is an Intel Core 2 duo with virtualization inside. I use the amd64
flavour. 
Thus my kernel is '2.6.18-4-xen-amd64'. Xen is version 3.0.3.

Using paravirtualization, I can start only other 64 bits guests.
   Either the standard linux-image-2.6.18-4-xen-amd64,
   Or a specially compiled one, with IDE included not-as-module
   I cannot manage to start the ubuntu 7.04 kernels for amd64.

Using full virtualization (hvm), I can start only 32 bits guests.
   Starting on an ISO of a Debian amd64 or Fedora x86_64 install fails.
   But starting on a i386 ISO of these allows the install to run OK.

Using hvm, I have to use ioemu for the network card to be recognized.
   vif = [ "type=ioemu, ip=..." ] without it, the card is not detected.
   BTW, I am using NAT for networking.

Then, starting to use all of these is a bit of a nightmare. Indeed hvm 
systems do start but does not show the SDL display. xm list reports the 
system as running, but I have no access to it (and network not yet 
configured) although it was present during install. Don't know what
happends 
here. I'd be glad for some hints?

One more question, how to mount inside dom0 a logical volume that is
given 
as a whole disk to a hvm (which had it partitionned).

Thanks in advance
Didier

-- 
Didier Trosset-Moreau
Agilent Technologies
Geneva, Switzerland

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