[vfio-users] What is the best host os for vfio vm gaming?

[Will Marler]

My guess is that "when it started to work, I kept it" sums it up for most
people on this list.

It certainly sums it up for me! I tried Arch, then Fedora when I struggled
with Arch (I tried Fedora b/c Alex's blogs were written from a Fedora
angle), then Arch again when I struggled with Fedora on things that I had
conquered with Arch the previous time.



On Fri, Feb 26, 2016 at 4:05 AM, Quentin Deldycke <quentindeldycke at gmail.com
> wrote:

> Yes, during my experimentation I made mistakes, when it started to work, I
> kept it :)
> On 26 Feb 2016 10:54 am, "Rokas Kupstys" <rokups at zoho.com> wrote:
>
>> Hmm what you just wrote i dont understand.
>>
>> CONFIG_RCU_NOCB_CPU_ALL=y
>>
>> Documentation:
>>
>> This option forces all CPUs to be no-CBs CPUs. The rcu_nocbs= boot
>> parameter will be ignored.
>>
>> So at least rcu_nocbs kernel parameter should not be needed as i
>> understand. Right?
>>
>> Still ill try these settings, cant be any worse :)
>>
>> On 2016.02.26 11:16, Quentin Deldycke wrote:
>>
>> Mainly:
>>
>> CONFIG_NO_HZ_FULL=y
>> CONFIG_RCU_NOCB_CPU_ALL=y
>>
>> Using cgroups / cpu pinnning, the cores won't have to handle any kernel
>> tick, but only run qemu
>>
>> For my i7 4790k, i am force to put vm on 3 threads (the main of my 3
>> cores). So kernel parameter:
>>
>> nohz_full=1,2,3,5,6,7 rcu_nocbs=1,2,3,5,6,7
>>
>> and my vm run on threads 1,2,3 (main thread of cores 1,2,3)
>> and qemu emulator run on threads 5,6,7 (sub threads of cores 1,2,3)
>>
>> Amd cards seems more affected by DPC than nvidia ones.
>>
>> Note an interesting thing:
>>
>>
>> http://www.guru3d.com/articles-pages/rise-of-the-tomb-raider-pc-graphics-performance-benchmark-review,9.html
>>
>> amd and multi cores is... erratic :)
>>
>> --
>> Deldycke Quentin
>>
>>
>> On 26 February 2016 at 09:53, Rokas Kupstys <rokups at zoho.com> wrote:
>>
>>> Could you elaborate on config differences? Still hunting for something
>>> that could help bringing DPC latency down since VM gaming is no go due to
>>> that..
>>>
>>>
>>> On 2016.02.26 10:51, Quentin Deldycke wrote:
>>>
>>> For my part:
>>>
>>> debian with some experimental package. When new kernel is out, i
>>> recompile it with some difference in config.
>>>
>>> But right now, 4.5 rc4.
>>>
>>> No problem with the host since ages. Plasma is buggy but... i think on
>>> every distro xD
>>>
>>>
>>> --
>>> Deldycke Quentin
>>>
>>>
>>> On 26 February 2016 at 09:43, Stein van Broekhoven <
>>> <stein at aapjeisbaas.nl>stein at aapjeisbaas.nl> wrote:
>>>
>>>> Dear All,
>>>>
>>>> What do you consider the distro of choice for a stable vm gaming build?
>>>> At the moment I'm on solus because it has 4.4.0 kernel by default and I
>>>> like the project.
>>>> Got libvirtd & virsh working with qemu but just can't get passthrough
>>>> to work as of now.
>>>>
>>>> I have a :
>>>> ASUS SABERTOOTH 990FX v1 with FX-8120
>>>> Ati Radeon 6xxx
>>>> Ati Radeon 5xxx
>>>>
>>>> I had it working at some point with ubuntu but that is some time ago
>>>> and don't remember how.
>>>>
>>>>
>>>> Kind regards,
>>>>
>>>> Stein van Broekhoven / System administrator
>>>> stein at aapjeisbaas.nl
>>>>
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>>>>
>>>
>>>
>>>
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