Re: [Xen-devel] Re: Re: Install paravirtualized drivers after bootingforhigh-performance IO

[Miao Feng <miaofeng@xxxxxxxxxxxxxxxx>]

Hi:
    As i recognized, paravirtulization is an implemention of high
performence virtulization in non-VT box, pure virtulization needs no
modification on guest os, but paravirtulization do needs. Is that right?
    If so, guest os on VT cpu will provide no paravirtulization?

    Any suggestions?

Miao
StarSoftComm.com


Arlen.D.Wang wrote:
>What is the difference between paravirtualized and virtualized?
>
>
>DengYu  Wang
>
>
>
>  
>>Where is get  a reference to the Windows support using Vanderpool
>>Technology ?
>>    
>
>The code in the unstable tree is the best reference (if you feel brave).
>There are the slides for a couple of talks about VT at the Xen Summit 
>webpage
>(http://summit.xensource.com/presentations/).
>
>  
>>Who is doing that Windows support using Vanderpool Technology ?
>>    
>
>This implementation work has been spearheaded by Intel, although I think 
>there
>are also some people at IBM also working on Xen/VT (is that right?)
>
>  
>>If Xen can run unmodified Linux , then Xen can run unmodified Windows also
>>, right ?
>>    
>
>Not yet: running Windows requires emulating extra 16 bit x86 stuff that 
>Linux
>doesn't need in order to run.  There is a design for supporting this and it
>might even be under development right now.
>
>HTH,
>Mark
>
>  
>>DengYu  Wang
>>
>>"Mark Williamson" <mark.williamson@xxxxxxxxxxxx>
>>§Õ?:200505091257.04034.mark.williamson@xxxxxxxxxxxxxxx
>>
>>    
>>>Hi there,
>>>
>>>I expect you've seen a reference to the Windows support using Vanderpool
>>>Technology?
>>>
>>>The current VT implementation provides an emulation of real hardware
>>>devices
>>>(e.g. an NE2000 ethernet card) to the guest OS.  This has the advantage
>>>that
>>>you can boot an unmodified OS and it'll recognise the emulated devices
>>>and Just Work.  This will allow you to install the OS using its usual
>>>installer
>>>and get things up and running.
>>>
>>>However, you pay a performance price for emulating a device like this.
>>>The
>>>most straightforward way to solve this is to replace the emulated device
>>>drivers with Xen-aware drivers (like the ones used by the Xen-native
>>>Linux port).  Once you've installed the OS, you can upgrade to the Xen
>>>device drivers.
>>>
>>>This should give better bandwidth for things like disk and network IO.
>>>
>>>Does that help?
>>>
>>>Cheers,
>>>Mark
>>>
>>>      
>>>>    What is "high-performance IO" ?
>>>>    What meaning for "Install paravirtualized drivers after booting for
>>>>high-performance IO"?
>>>>
>>>>    Thanks,
>>>>        
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>>    
>
>
>
>
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>  


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