Re: [Xen-devel] about page cache architecture of the dom0 and domUs in xen platform

[hxkhust <hxkhust@xxxxxxx>]

Hi,Pasi KÃrkkÃinen,

 

In most cases, I use "file:/..." or "tap:qcow2:..."  for my VMs.When I use "tap:aio:.." in the configuration,somgthing wrong will happen.At the first time I speculate that the blktap/blktap2 module is not installed successfully.Thus some time ago I try to figure out the problem.However I failed in the end.Could you tell me the difference between "file:" and "tap:aio" from the page cache architecture side?

The answer to this question is of importance for me.I need your help.Thank you. 

HXK

At 2012-02-01 15:51:00,"Pasi KÃrkkÃinen" <pasik@xxxxxx> wrote:
>On Wed, Feb 01, 2012 at 11:50:06AM +0800, hxkhust wrote:
>>    Hi,
>>    I encounter a problem that has puzzled me for a long time.On a Xen
>>    virtualization platform, some VMs ,whose virtual disks are image files
>>    ,are running in DomUs.Under this situation ,does the Dom0 cache the pages
>>    from the VMs?Does the filesystem in Dom0 see the VMs as general processes?
>> 
>
>It depends which disk backend driver you're using for the domU disks..
>(file: or tap:aio:)
>
>-- Pasi
>

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