Re: [Qemu-devel] windows guest virtio serial and balloon driver test issues

["Cao,Bing Bu" <mars@linux.vnet.ibm.com>]

Hi,

     Rozenfeld,Thanks,got it!

     And do you know whether there are some sufficient test tools (such 
as IOmeter)
     to test the virtio driver performance?


On 11/25/2011 02:42 PM, Vadim Rozenfeld wrote:
> On Fri, 2011-11-25 at 09:59 +0800, Cao,Bing Bu wrote:
>> Hi,all
>>
>>
>> Thanks,Frenkel.The test application of the balloon must be run as
>> admin.
>>
>>
>>
>> But I found 2 problems(question) this week when testing windows guest
>> drivers:
>>
>>
>>        *
>>      If only virtio serial driver installed,the virtio serial test app
>> can not enumerate/find the virtio serial device,
>>      but after virtio balloon driver installed,the app can find the
>> virtio serial device correctly.
>>      Because of the same GUID which balloon and serial both use?
> Correct. This test application is a very simplified one. We published it
> mostly as an example, but not as a real test application. It doesn't
> enumerate all virtio serial instances, rather just find the
> first one and use it.
>>
>>
>>        *
>>      When inflate/deflate the balloon size using qemu monitor balloon
>> command,
>>      the total physical memory did not decrease/increase
>> correspondingly,as seen from "resource monitor",
>>      only the "available memory" size descrease/increase.But I test on
>> other Linux guest,
>>      the total physical memory of the guest OS was changed.
>>
>>      Is it a problem? If not,is it confusing to user?
>>      Related to the windows internal memory management?
>>
> Total physical memory on Windows will always be the same,
> because we don't hot-plug/unplug physical memory.
> Balloon driver works with non-paged pool memory instead.
> So, every time you inflate or deflate balloon in your system,
> you should see "Available memory" is changing, while physical
> will always be the same.
>
> Best,
> Vadim.
>
>>
>>
>> On 11/21/2011 06:33 PM, Arkady Frenkel wrote:
>>> On 11/21/2011 10:39 AM, Cao,Bing Bu wrote:
>>>> Hi,
>>>>
>>>>      Recently,I am testing windows guest driver on Win7 and
>>>> WinXP(32bit) with the latest windows guest driver development source.
>>>>      Download from
>>>> http://alt.fedoraproject.org/pub/alt/virtio-win/latest/images/src/
>>>>
>>>>
>>>> virtio-blk:
>>>>      It seems OK both on Win7 and WinXP,the r/w performance is better
>>>> than IDE disk.
>>>>
>>>>
>>>>
>>>> virtio-serial:
>>>>      I tried to test virtio serial driver using the test application in
>>>> the project.
>>>>
>>>>      WinXP:
>>>>      Write: OK
>>>>      Read: Error: Read File Failed.
>>>>
>>>>      Win7:
>>>>      The test application return error "can not find vioserial device".
>>>>      But i debug the code and check that the GetDevicePath() return
>>>> value is not NULL,and same as the value when testing on WinXP.
>>>>      Why the CreateFile() in init() not called? (:
>>>>
>>>>
>>>> virtio-balloon:
>>>>
>>>>      QEMU monitor: device_add virtio-balloon-pci
>>>>
>>>>      On the guest,a new device "PCI standard RAM controller" added.
>>>>      But the Device Manager prompt "No driver installed for this
>>>> device", but install the driver "balloon.sys" failed.
>>>>      It said the driver is up to date.    Confused. (:
>>>>
>>>>      How can I install and test the balloon driver on Windows?
>>>>
>>>>
>>>>
>>>> The kvm-guest-drivers-windows.git on kernel.org is not available,is
>>>> there any mirror git repository?
>>>> Any mail-list or bugzilla for windows guest driver?
>>>>
>>>> Any help from will be appreciated.
>>>>
>>>>
>>> You need to run serial test app as admin only.
>>>
>>> To install balloon you have to go throw additional option when click on
>>> "Browse my computer for driver software". Choose "Let me pick from the
>>> list of device drivers on my computer" option.
>>>
>>> Arkady
>>>
>> Best regards
>> Cao,Bing Bu
>>
>
>


-- 
Best Regards,
Cao,Bing Bu