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Re: [Xen-users] xen in xen in xen....

  • To: xen-users@xxxxxxxxxxxxx
  • From: Gordan Bobic <gordan@xxxxxxxxxx>
  • Date: Fri, 28 Feb 2014 09:09:26 +0000
  • Delivery-date: Fri, 28 Feb 2014 09:12:18 +0000
  • List-id: Xen user discussion <xen-users.lists.xen.org>

My findings a while back were that at 1st level you should expect a 20% 
performance drop (Note: Xen beats the competition here - other hypervisors do 

More details here:

I am not sure what the overhead scaling is when nesting - it could be close to 
linear (multiply by 0.8 for each layer) or it could be worse due to greater 
cache contention and increased context switching.

Ian Campbell <ian.campbell@xxxxxxxxxx> wrote:

>On Thu, 2014-02-27 at 14:26 -0600, John Wargo wrote:
>> I don't have any experience with it, but looking at the configuration
>> below it looks possible.
>> http://xenbits.xen.org/docs/unstable/man/xl.cfg.5.html
>> (Search for "nestedhvm=BOOLEAN")
>In principal you should be able to nest as far as you like but a) I
>expect almost no one else has tried this and b) once you go more than a
>single level of nesting performance is going to tail off pretty heavily.
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