Re: [Xen-users] What do you do for Xen 4.2?

[Jonathan Tripathy <jonnyt@xxxxxxxxxxx>]

> Hi, Jonathan,
>
> Just sharing my exprerience:
Thanks for sharing
> I have been using Xen 4.1 over Ubuntu 12.04 since Ubuntu 12.04 Beta for
> developing purposes and hosting application server with high network io
> and cpu load and can say that all works pretty well, I had some issues,
> but mostly of them were resolved.
> What can I say from my point of view:
> 1. PV DomU works out of the box, I had not any issues with it
Excellent. Our Xen platform is used for PV almost exclusively.
> 2. To start HVM DomU I had to fix some symbolic links. I think that
> won't an issue for you, you will find info in xen logs about missing
> files when you will try to start HVM DomU. AFAIR couple of files were
> renamed in ubuntu packages i. e. xen ->  xen-precise and this made an
> issue.
Thanks for the heads up. Should be easy enough to fix though if it's 
just a symlink issue.
> In HVM DomU running Ubuntu 10.04/12.04 I found significant drops in
> perfomance when network interface under high load, so after tests I did
> not use HVM at all.
> Since 11.10 Ubuntu supports PV+HVM mode in xen, so I switched HVM
> machines to PV+HVM and issues with perfomance have gone away.
If we use HVM, we always try to use PV+HVM drivers, as Xen HVM 
performance has never been that great IMHO
> I don't remember exactly, in HVM or PV+HVM, but I had to create network
> interface manually, otherwise it could not work with xen bridge.
We create all our bridges and do networking setup manually anyway. Which 
interface are you specifically talking about?
> Also, I could not resolve an issue with ubuntu DomU screen resolution in
> HVM/PV+HVM mode. Maximal resolution I could manage to 1024x768. I posted
> bug at the launchpad, but I think it won't be fixed in near future.
> And I did not try to run windows in DomU, so don't know how it will
> work.
We don't use any form of GUI using Linux. When it comes to windows, RDP 
is use for access with Xen VNC used for initial setup/fixing broken stuff
> 3. I could not enable iommu nor verbose mode for iommu. Don't know is
> that a bug in Ubuntu packages or bug in xen, no one could tell me why
> verbose mode for iommu did not work.
Now this is a concern. We don't use iommu at all however it's nice 
knowing that the feature is available...
> Sergey Zhukov
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxx
http://lists.xen.org/xen-users