Re: What are the minimal required FC6 packages for Dom0?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi,
  Actually, just a small point of clarification.  Guest OSes can know if
  they're running in a hypervisor in hardware virtualization.  If you're
  using AMD-V, there's an instruction called VMMCALL that allows the
  guest OS to check to see if it's running under a hypervisor or not. 
  On Intel, the equivalent instruction is VMCALL.  This is useful
  because if it finds that it is running under a hypervisor, it can do
  things such as ask for more memory if it's running out of memory or
  ask for more disk space.  Here's an article about if:  
  http://developer.amd.com/articles.aspx?id=15&num=3  You can also
  search google for VMMCALL or VMCALL :)

PS.  Of course, the guest OS would have to have the ability to do this
check.  I'm not sure how complicated it would be.  Probably a patch to
the kernel or something.

> On Sat, Oct 07, 2006 at 11:12:00PM +0200, Aryanto Rachmad wrote:
> > ----- Original Message ----- 
> > From: "Daniel P. Berrange" <berrange redhat com>
> > To: "Aryanto Rachmad" <aryanto chello at>
> > Cc: <fedora-xen redhat com>
> > Sent: Saturday, October 07, 2006 10:43 PM
> > Subject: Re:  What are the minimal required FC6 packages for Dom0?
> > 
> > 
> > >
> > > Fully-virt just lets you run unmodified operating systems (notably Windows,
> > > or older versions of Linux for which there is no Xen kernel available).
> > > If you only care about running modern Xen enabled Linux  kernels then
> > > you have on need for fully-virt. As a general rule, if there is a paravirt
> > > version of your desired OS available, using that will always be preferrable
> > > to fullyvirt. The network & disk I/O is much faster in paravirt, and since
> > > the kernel is informed when the hypervisor re-schedules it, it can do much
> > > more accurate process accounting in the guest. It is basically impossible
> > > to do accurate process scheduling in fully-virt, since the guest kernel
> > > has no knowledge of the fact that its running under a hypervisor.
> > >
> > 
> > Thanks a lot Dan,
> > 
> > I am actually planning to use Windows XP on one of the guests. So in this case I can not
> > do that, cann't I? But on the other hand, I prefer para-virtualised as it has more
> > advantages as you explained.
> 
> Yeah, for Windows XP you'll need an Intel-VT or AMD-V  capable CPU.
> 
> Regards,
> Dan.
> --
> |=- Red Hat, Engineering, Emerging Technologies, Boston.  +1 978 392 2496 -=|
> |=-           Perl modules: http://search.cpan.org/~danberr/              -=|
> |=-               Projects: http://freshmeat.net/~danielpb/               -=|
> |=-  GnuPG: 7D3B9505   F3C9 553F A1DA 4AC2 5648 23C1 B3DF F742 7D3B 9505  -=| 
-- 
  Mathew Brown
  mathewbrown@xxxxxxxxxxx

-- 
http://www.fastmail.fm - Or how I learned to stop worrying and
                          love email again

--
Fedora-xen mailing list
Fedora-xen@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/fedora-xen

[Index of Archives]     [Fedora General]     [Fedora Music]     [Linux Kernel]     [Fedora Desktop]     [Fedora Directory]     [PAM]     [Big List of Linux Books]     [Gimp]     [Yosemite News]

  Powered by Linux