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

To: topperxin <topperxin@xxxxxxx>
Subject: Re: [Xen-devel] Performances compare between PV domU & HVM domU & PV-on-HVM domU
From: George Dunlap <dunlapg@xxxxxxxxx>
Date: Fri, 24 Dec 2010 17:11:25 +0000
Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, xen-users <xen-users@xxxxxxxxxxxxxxxxxxx>
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Sorry, not so close to Christmas. :-)

(I did mean to reply to this, but I haven't had time -- I'll try after
I return in the new year.)


2010/12/23 topperxin <topperxin@xxxxxxx>:
> no one want to discuss the advantages between PV domU & HVM domU?
> At 2010-12-22 17:01:31,topperxin <topperxin@xxxxxxx> wrote:
> 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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