[ovirt-users] Info about windows guest performance

[Gianluca Cecchi]

On Sun, Feb 11, 2018 at 9:33 AM, Yaniv Kaul <ykaul at redhat.com> wrote:

>
>
> On Sat, Feb 10, 2018 at 8:41 PM, Gianluca Cecchi <
> gianluca.cecchi at gmail.com> wrote:
>
>> On Fri, Feb 9, 2018 at 4:32 PM, Gianluca Cecchi <
>> gianluca.cecchi at gmail.com> wrote:
>>
>>>
>>>
>>> If I edit the VM, in general settings I see "Other OS" as operating
>>> system.
>>> In General subtab after selecting the VM  in "Virtual Machines" tab I
>>> again see "Other OS" in "Operating System" and the field "Origin" filled
>>> with the value "VMware"
>>>
>>> During virt-v2v it seems it was recognized as Windows 2008 though...
>>>
>>> libguestfs: trace: v2v: hivex_value_utf8 = "Windows Server 2008 R2
>>> Enterprise"
>>> libguestfs: trace: v2v: hivex_value_key 11809408
>>>
>>> I can send all the log if it can help.
>>> Thanks,
>>> Gianluca
>>>
>>
>>
>> So it seems it has been a problem with virt-v2v conversion, because if I
>> shutdown the VM and set it to Windows 2008 R2 x86_64 and optimized for
>> server and I run it, I get this flag for the cpu:
>>
>
> A new virt-v2v was just released, worth testing it. It has some nice
> features, and perhaps fixes the above too.
> For example:
>        Virt-v2v now installs Windows 10 / Windows Server 2016 virtio block
>        drivers correctly (Pavel Butsykin, Kun Wei).
>
>        Virt-v2v now installs virtio-rng, balloon and pvpanic drivers, and
>        correctly sets this in the target hypervisor metadata for
> hypervisors
>        which support that (Tomáš Golembiovský).
>
>        Virt-v2v now installs both legacy and modern virtio keys in the
> Windows
>        registry (Ladi Prosek).
>
>
>

Thanks for the info.
In the mean time after installing virtio-win on proxy host I retried with
the same version of virt-v2v provided with 4.1.9:
virt-v2v-1.36.3-6.el7_4.3.x86_64
and then selecting and injecting it in the import window and the VM
correctly starts with virtio drivers (version 61.74.104.14100) after a
reboot requested (first starts remains in black window for a couple of
minutes and then asks to restart)
It also has qxl drivers (6.1.0.1024)
But the VM remains as "Other OS" and obviously has no hv_ optimization.
I'm going to try the new version as you suggested.
It would be nice also to have virtio-scsi option and not only the virtio
option directly in import function....

BTW: I see that in case a target VM with the same name of source exists,
I'm given an error and I can't change the VM name on destination....
This seems to me a big limitation, because forces to rename the source VM
or rename a pre-existing VM at destination with the same name....




>
>> -cpu Westmere,vmx=on,hv_time,hv_relaxed,hv_vapic,hv_spinlocks=0x1fff
>>
>> BTW: what are the other flags for:
>>
>>
>> hv_spinlocks=0x1fff
>> hv_relaxed
>> hv_vapic
>> ?
>>
>
> These are the enlightenment that allow Windows guests to run faster (hv =
> hyper-v).
> See[1]
> Y.
>
> [1] http://blog.wikichoon.com/2014/07/enabling-hyper-v-
> enlightenments-with-kvm.html
>
>
Thanks for the Cole link

Gianluca
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