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 <[email protected] > <mailto:[email protected]>> 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 >> <[email protected] <mailto:[email protected]>> 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 >> [email protected] <mailto:[email protected]> >> >> _______________________________________________ >> vfio-users mailing list >> [email protected] <mailto:[email protected]> >> https://www.redhat.com/mailman/listinfo/vfio-users >> >> >> >> >> _______________________________________________ >> vfio-users mailing list >> [email protected] <mailto:[email protected]> >> https://www.redhat.com/mailman/listinfo/vfio-users > > > _______________________________________________ > vfio-users mailing list > [email protected] <mailto:[email protected]> > https://www.redhat.com/mailman/listinfo/vfio-users > > > > > _______________________________________________ > vfio-users mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/vfio-users
_______________________________________________ vfio-users mailing list [email protected] https://www.redhat.com/mailman/listinfo/vfio-users
