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

[Rokas Kupstys]

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
> <mailto: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 <mailto: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 <mailto:stein at aapjeisbaas.nl>
>>
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>>
>>
>>
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