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Re: [Xen-users] PV Drivers in Linux HVM DomU?

  • To: "Pasi Kärkkäinen" <pasik@xxxxxx>
  • From: "Emre Erenoglu" <erenoglu@xxxxxxxxx>
  • Date: Fri, 23 Nov 2007 11:39:35 +0100
  • Cc: Xen Users <xen-users@xxxxxxxxxxxxxxxxxxx>
  • Delivery-date: Fri, 23 Nov 2007 02:40:34 -0800
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Hi Pasi, my comments below:

On Nov 22, 2007 7:24 PM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
On Thu, Nov 22, 2007 at 06:48:26PM +0100, Emre Erenoglu wrote:
> > >
> > > Yes,  however, my DomU crashes on boot with the PV kernel. I couldn't
> > find
> > > why.
> > >
> >
> > What dom0 distribution are you using?
> >
> > Are xen/kernel packages provided by the distribution or self compiled?
> >
> I'm using Ubuntu 7.10 with 2.6.22-14-xen as Dom0. Packages are provided by
> the distribution.


Afaik Xen in Ubuntu (and in Debian) is not very well tested..


> >
> > What is your domU distribution? Is the domU PV kernel from the
> > distribution, or self compiled?
> DomU is Pardus 2007.2. It has default kernel 2.6.18-8, but as I wanted
> paravirtualization, I was using Ubuntu's 2.6.22-14-xen. The crash started
> with this release kernel. when Ubuntu was beta, I was able to use
> 2.6.22-12-xen without problems.
> Pardus 2007.2 is able to work with Ubuntu 2.6.22-14-generic kernel (on bare
> metal) without problems. It used to be working as DomU with
> 2.6.22-12-xenbut not anymore with
> 2.6.22-14-xen. I filed a bug report 1 month ago, no answer yet.
> I switched to VMWare for the moment until I resolve this issue, VMWare disk
> performance is not good even if I enabled PV support (VMI).
> Therefore, my aim now is to use standard Pardus kernel 2.6.18-8, but compile
> PV drivers for use with Dom0 (Ubuntu 7.10 2.6.22-14-xen , Xen 3.1)

I have never heard of Pardus before :) So I can't comment about it or it's
support for Xen..

It's OK with Xen ( http://www.pardus.org.tr/eng/index.html) . Normally it has XEN 3.1 with its 2.6.18 kernel but I would like to use a newer kernel.

I would recommend you to use RHEL, CentOS, SLES, Opensuse or Fedora.. those
distributions are known to ship Xen and work to make it stable/usable.. 

Get for example Fedora 8, use it on both dom0 and on domU, and you should get
things working well..

I also have Fedora 8 as Dom0, but I think Ubuntu 7.10 runs less problematic Xen than Fedora. I have numerous problems with Fedora 8, especially with it's Virt-Manager and networking (doesn't support bridging out of the box, have to do some tricks, virt-manager can't make a PV domain, doesn't have xenbr0 but virbr0 etc. etc.). I just couldn't get used to it.

Nevertheless, my Pardus can't boot with its 2.6.21 xen kernel as I guess Fedora guys likes to make some non-standard way to making INIT. (Ubuntu kernels just boot fine on bare-metal).

I don't understand why I can't just replace the kernel and still boot fine (good old linux days?).

RHEL 5.1 or CentOS 5.1 should be good choises too..

-- Pasi

Thanks a lot for your patience,


Emre Erenoglu
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