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

[Quentin Deldycke]

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>
>> 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
>>>
>>> _______________________________________________
>>> vfio-users mailing list
>>> vfio-users at redhat.com
>>> https://www.redhat.com/mailman/listinfo/vfio-users
>>>
>>
>>
>>
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