Re: [Xen-devel] VM memory allocation speed with cs 26056

[Zhigang Wang <zhigang.x.wang@xxxxxxxxxx>]

On 11/12/2012 10:17 AM, Jan Beulich wrote:
>>>> On 12.11.12 at 16:01, Zhigang Wang <zhigang.x.wang@xxxxxxxxxx> wrote:
>> My conclusion from the test:
>>
>>   - HVM create time is greatly reduced.
>>   - PVM create time is increased dramatically for 4G, 8G, 16G, 32G, 64G, 
>> 128G.
>>   - HVM/PVM destroy time is not affected.
>>   - If most of our customers are using PVM, I think this patch is bad: 
>> because
>> most VM memory should under 128G.
>>   - If they are using HVM, then this patch is great.
>>
>> Questions for discussion:
>>
>>   - Did you get the same result?
>>   - It seems this result is not ideal. We may need to improve it.
> We'd first of all need to understand how this rather odd behavior
> can be explained. In order to have a better comparison basis, did
> you also do this for traditional PV? Or maybe I misunderstand
> what PVM stands for, and am mixing it up with PVH? You certainly
> agree that the two curves for what you call PVM have quite
> unusual a relationship.
>
Let me attach the HVM and PV guest configure files.

Actually I use xm create -p to create the VM, and destroy it immediately. So the
guest kernel doesn't matter.

Please see the test script for detail.

Thanks,

Zhigang

Attachment: pvm.cfg
Description: Text document

Attachment: hvm.cfg
Description: Text document

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