Re: VM memory allocation speed with cs 26056

[Zhigang Wang <zhigang.x.wang@oracle.com>]

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On 11/12/2012 10:17 AM, Jan Beulich wrote:
>>>> On 12.11.12 at 16:01, Zhigang Wang <zhigang.x.wang@oracle.com> 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 #2: pvm.cfg --]
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vif = []
disk = ['file:/OVS/Repositories/0004fb0000030000013b01f1d983f4db/VirtualDisks/0004fb00001200004b87f14bde146192.img,xvda,r']
uuid = '0004fb00-0006-0000-7a63-1bf13fa33c30'
on_reboot = 'restart'
memory = 1536000
bootloader = '/usr/bin/pygrub'
name = '0004fb00000600007a631bf13fa33c30'
vfb = ['type=vnc,vncunused=1,vnclisten=0.0.0.0,keymap=en-us']
vcpus = 1

[-- Attachment #3: hvm.cfg --]
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serial = 'pty'
disk = ['file:/share/vm/microcore_3.5.1.iso,hdc:cdrom,r']
boot = 'd'
memory = 4096
pae = 1
acpi = 1
apic = 1
vnc = 1
vncunused = 1
vnclisten = '0.0.0.0'
name = 'microcorelinux_x86_hvm'
builder = 'hvm'
vcpus = 1

[-- Attachment #4: Type: text/plain, Size: 126 bytes --]

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