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[Xen-devel] Performances compare between PV domU & HVM domU & PV-on-HVM

To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: [Xen-devel] Performances compare between PV domU & HVM domU & PV-on-HVM domU
From: topperxin <topperxin@xxxxxxx>
Date: Wed, 22 Dec 2010 17:01:31 +0800 (CST)
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hi all
    As we all know, xen currently support these three types domU mode, and every mode has it's own features, such as:
        Advantages                 Disadvantages
   PV:  Good I/O performance        Have to modify the domU kernel
        Hardware Independent        Can't support windows
HVM: no need to modify kernel    not good at I/O performance
        support various OS include  Hardware dependent(VT)  
        linux, windows      

PV-on-HVM: Optimize the I/O           Have to transplant the pv               performance with pv drivers   drivers between various kernel           support various OS include    versions
        linux, windows                              

        1.Are the compare right? Or where can I get the more detailed performance compare given by the government? Specially, what about I/O performance between PV & PV-on-HVM???
         2.When I choose domU mode, what conditions should I care for?
         3.Is PV can use VT hardware technology?
         4.In future, which modes will become the main direction?
        Any reply will be appreciated, thanks a lot.                             

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