Re: [Xen-users] RHEL xen vs kvm

[Grant McWilliams <grantmasterflash@xxxxxxxxx>]

On Thu, May 13, 2010 at 5:49 AM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:

On Thu, Apr 29, 2010 at 09:40:39PM +0300, Pasi Kärkkäinen wrote:
> On Thu, Apr 29, 2010 at 11:03:55AM -0700, Grant McWilliams wrote:
> >    On Thu, Apr 29, 2010 at 9:53 AM, Pasi KÀrkkÀinen <[1]pasik@xxxxxx>
> >    wrote:
> >
> >      On Wed, Apr 21, 2010 at 11:42:31PM -0700, Grant McWilliams wrote:
> >      > Â  Â On Wed, Apr 21, 2010 at 7:26 PM, Jeff Sturm
> >      <[1][2]jeff.sturm@xxxxxxxxxx>
> >      >
> >
> >      Do you have some benchmarks to prove KVM being faster than Xen HVM?
> >
> >    Yes, I do. I've been gathering statistics for quite a while because I'm
> >    writing a white paper on Linux Virtualization Performance.
> >    I'll need to dig them up after I get back from work. The difference is
> >    enough to sway the decision if someone was only going to virtualize
> >    Windows. If someone were to just use PV though Xen wins hands down.
> >
>
> I'm really surprised if there is a big difference between Xen HVM vs. KVM.
>
> What software versions did you use?
> What kind of hardware?
>
> I'm sure Citrix Xen guys want to see the results and comment if there's something to tweak :)
>

Replying to myself..

Grant: I'm not sure if you replied to this.. I had some trouble with my email provider
getting blacklisted because of some spam problems.

My last response was this...  I'm working 110 hrs a week and teaching two college classes. I'll get back to this topic!

For now. I predict (and you can quote me) that Xen Dom0 will be removed 
in all big distros in time.
Mind you I don't want this because I use it exclusively for my server 
virtualization needs. The reason 
for this is if KVM provides 95% of what Xen does and is already included
 and it's easy for the packagers
to maintain then everyone will move to it. Every year at LinuxFest NW I 
hear the Redhat people complaining about
how hard it is to get the 
Xen patches to work on newer kernels. As of RHEL6 those complaints have 
gone away because
Xen Dom0 support is gone. Suse would probably like to stop doing the 
work they're doing as well. By the time
Xen Dom0 will be in the 
mainline kernel nobody will care anymore. 

I think a shift in 
mentality is in order. We're not trying to get VMware ESX in the kernel,
 if we want to use it we download
the CD and install it. I think this is where Xen will end up. XCP and 
XenServer are already there.

Grant
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