Fall 2007 cs591:Networks and Distributed Systems
		Paper Evaluation From



Your Name:



Paper: 15

Due: November 27, 2007

Title: Xen and the Art of Virtualization by
	Paul Barham, Boris Dragovic, Keir Fraser, Steven Hand, Tim Harris,
        Alex Ho, Rolf Neugebauer, Ian Pratt, and Andrew Warfield



Instructions
    Please type your answers and send the form to
    
        riesen@cs.unm.edu

    with the subject line:
    
        "Notes for Paper 15"

    or turn in a hard-copy.  If you email the form, leave it in plain
    ASCII, or convert it to PDF or Postscript. Do not send MS Word or
    any other proprietary format. I have a hard time reading those.

    In order to get credit for the assignment, make sure I have your
    submission at the beginning of the class in which we discuss
    this paper.

    If you were selected to lead the group discussion for this paper,
    you do not need to fill out this form.



Survey
    What is your opinion of this paper? Grade each of the following
    categories with an A, B, C, and F:

	Readability/Clarity:

	Relevance to class/comps:

	Importance:

	Overall:



Evaluation:
    For the following give succinct but precise answers. At most a
    handful of sentences per question.

    - What is the main contribution of this paper?


    - Is this paper important in the field? Why, or why not?


    - Do you agree with the conclusions of the paper; i.e. is the
        paper correct? State why you agree or disagree.


    - Are there parts you did not understand? (So we can cover them
        in class). Try to find out yourself first and bring that
        information to class.


    - How many papers in the reference section have you read
        before? Which ones?


    - What would you suggest for future work? (In addition or
	instead of the list in the paper.)


    - What are the key points of this paper to remember?


    - Does the paper use any terms or concepts that seem important?
	These are things the paper assumes people know, which may or
        may not be true for a given reader.



Paper specific questions:
    1). What is paravirtualization?



    2). A guest OS that runs on top of Xen has its own process scheduler. How
        does that schedular interact with Xen's scheduling of the OSes? Do
        these two schedulers interact with each other? Interfere with each
        other?



    3.) Why does XenoLinux perform (usually) so much better than User-Mode
        Linux? What is the difference in implementation between the two, and
        why does it make a performance difference?