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

[Vadim Rozenfeld <vrozenfe@redhat.com>]

On Tue, 2011-11-29 at 08:58 +0800, Cao,Bing Bu wrote:
> 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?
IoMeter is good. But you also might be interested in 
SQLIOSim, database hammer, and diskio (part of WLK) + xperf.
> 
> 
> 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
> >>
> >
> >
> 
>