* Re: about page cache architecture of the dom0 and domUs in xen platform
2012-02-01 3:50 about page cache architecture of the dom0 and domUs in xen platform hxkhust
@ 2012-02-01 7:51 ` Pasi Kärkkäinen
2012-02-01 15:57 ` hxkhust
2012-02-02 13:14 ` hxkhust
2 siblings, 0 replies; 4+ messages in thread
From: Pasi Kärkkäinen @ 2012-02-01 7:51 UTC (permalink / raw)
To: hxkhust; +Cc: xen-devel@lists.xensource.com
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
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: about page cache architecture of the dom0 and domUs in xen platform
2012-02-01 3:50 about page cache architecture of the dom0 and domUs in xen platform hxkhust
2012-02-01 7:51 ` Pasi Kärkkäinen
@ 2012-02-01 15:57 ` hxkhust
2012-02-02 13:14 ` hxkhust
2 siblings, 0 replies; 4+ messages in thread
From: hxkhust @ 2012-02-01 15:57 UTC (permalink / raw)
To: Pasi Kärkkäinen; +Cc: xen-devel@lists.xensource.com
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Hi,Pasi Kärkkäinen,
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 Kärkkäinen" <pasik@iki.fi> 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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* Re: about page cache architecture of the dom0 and domUs in xen platform
2012-02-01 3:50 about page cache architecture of the dom0 and domUs in xen platform hxkhust
2012-02-01 7:51 ` Pasi Kärkkäinen
2012-02-01 15:57 ` hxkhust
@ 2012-02-02 13:14 ` hxkhust
2 siblings, 0 replies; 4+ messages in thread
From: hxkhust @ 2012-02-02 13:14 UTC (permalink / raw)
To: Pasi Kärkkäinen; +Cc: xen-devel@lists.xensource.com
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Hi,Pasi Kärkkäinen,
At 2012-02-01 15:51:00,"Pasi Kärkkäinen" <pasik@iki.fi> 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
>
In the last email I top-post and Tim remind me of that ,so I send the same content to you again.
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
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[-- Attachment #2: Type: text/plain, Size: 138 bytes --]
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http://lists.xensource.com/xen-devel
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