[vfio-users] Help Patching Qemu for Vendor

[Spam House]

Thibaut,

Thanks for the info. The performance difference I am measuring with 3dmark
firestrike.

Unraid Win10 VM (QEMU/KVM):
Overall Score = 14037
Graphics = 17152

Arch Win10 VM (QEMU/KVM)
Overall Score  = 12085
Graphics = 13658

I have not fully implemented huge pages yet but the CPU performance seems
to be about the same. The gpu specifically has greatly reduced performance.

On Sun, May 8, 2016 at 4:12 PM, thibaut noah <thibaut.noah at gmail.com> wrote:

> You're trying to use qemu features in libvirt xml, you cannot do that
> except through command line.
> What you can do quickly is creating a little bash script to replace your
> qemu executable and use it for libvirt
>
> $ cat qemu-kvm-hv-vendor
> #!/bin/sh
> exec PATHTOYOURQEMUKVM \
>     `echo "\$@" | sed 's|hv_time|hv_time,hv_vendor_id=KeenlyKVM|g'`
>
> $ chmod 755 qemu-kvm-hv-vendor
>
> $ virsh edit YOURVM
>
> Replace <emulator>PATHTOYOURQEMUKVM</emulator> with PATHTO/qemu-kvm-hv-
> vendor
>
> For more features you can replace it with this :  "
> *hv_time,hv_relaxed,hv_spinlocks=0x1fff,hv_vpindex,hv_reset,hv_runtime,hv_crash,hv_vendor_id=freyja"*
>
> *credit to alex and okky*
>
> 2016-05-08 23:08 GMT+02:00 thibaut noah <thibaut.noah at gmail.com>:
>
>> Install qemu-git from the aur and you would have the patches with ti.
>>
>> You're talking about degraded performances, could you be more specific?
>> I personnaly have hyper-v features and i don't see any difference
>> whatsoever.
>> Did you remember to modify your kernel config?
>>
>> 2016-05-08 22:49 GMT+02:00 Alex Williamson <alex.l.williamson at gmail.com>:
>>
>>> On Sun, May 8, 2016 at 2:30 PM, Spam House <kthxplzdie at gmail.com> wrote:
>>>
>>>> Hey All,
>>>>
>>>> Could anyone give me a quick summary of how to apply this (
>>>> http://www.spinics.net/lists/kvm/msg121742.html) patch to Qemu on Arch
>>>> Linux.
>>>>
>>>> I've cloned the Qemu git and have tried various ways of parsing the
>>>> info in the link into other files and using 'ed' to try and append/update
>>>> the files with no success.
>>>>
>>>> Example:
>>>> git clone qemu
>>>> cd qemu/target-i386
>>>> nano cpu-qom.b (insert diff changes and save add 'w' at the very end)
>>>> ed - cpu-qom.h < cpu-qom.b
>>>>
>>>> ed returns ? and deletes/blanks out cpu-qom.h
>>>>
>>>> Complete noob any help appreciated!
>>>>
>>>> I do have a windows10 vm with my 980ti passthrough running
>>>> successfully. The performance has degraded since switching from Unraid to
>>>> Arch and the only difference I can find is HyperV related. It seems this is
>>>> the last hurtle.
>>>>
>>>
>>> This has been in QEMU since the 2.5 release, if you're cloning qemu.git,
>>> the change is already there.  Surely Arch has QEMU builds including it as
>>> well.
>>>
>>> _______________________________________________
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>>> vfio-users at redhat.com
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>>>
>>>
>>
>
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