Take the 2-minute tour ×
Server Fault is a question and answer site for system and network administrators. It's 100% free, no registration required.

I have read that in para virtualization hosted virtual machines are aware that they are being virtualized, and this allows them to increase their performance. But, how does the hosted machine know they are virtualized as since we are not modifying any kernel parameters of the guest os while installing?

What do we need to do on the host OS to give it a performance increases resulting from recognising that it is in a virtual environment? What are the best ways to optimize a Ubuntu VM for in an xen environment?

share|improve this question

closed as not constructive by adaptr, Kenny Rasschaert, Shane Madden, Brent Pabst, Magellan Nov 11 '12 at 5:17

As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance.If this question can be reworded to fit the rules in the help center, please edit the question.

1 Answer 1

up vote 5 down vote accepted

Paravirtualized Xen VMs used to use special paravirtualized (domU) kernels but modern kernels include domU features by default. That said, the kernel is able to detect when it is being run in Xen environment and use the domU interfaces then.

share|improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.