<html> <head> <meta content="text/html; charset=windows-1252" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> Hmm what you just wrote i dont understand.<br> <blockquote type="cite">CONFIG_RCU_NOCB_CPU_ALL=y</blockquote> Documentation:<br> <blockquote type="cite">This option forces all CPUs to be no-CBs CPUs. The rcu_nocbs= boot parameter will be ignored.</blockquote> So at least rcu_nocbs kernel parameter should not be needed as i understand. Right?<br> <br> Still ill try these settings, cant be any worse :)<br> <br> <div class="moz-cite-prefix">On 2016.02.26 11:16, Quentin Deldycke wrote:<br> </div> <blockquote cite="mid:CAHYLta6bCpO14Ez+_xccFm==LG7qpokgVEOc_2-8UqFGr+a2bw@mail.gmail.com" type="cite"> <div dir="ltr"> <div> <div> <div> <div> <div> <div>Mainly:<br> <br> CONFIG_NO_HZ_FULL=y<br> CONFIG_RCU_NOCB_CPU_ALL=y<br> <br> </div> Using cgroups / cpu pinnning, the cores won't have to handle any kernel tick, but only run qemu<br> <br> </div> For my i7 4790k, i am force to put vm on 3 threads (the main of my 3 cores). So kernel parameter:<br> <br> nohz_full=1,2,3,5,6,7 rcu_nocbs=1,2,3,5,6,7<br> <br> </div> and my vm run on threads 1,2,3 (main thread of cores 1,2,3)<br> </div> and qemu emulator run on threads 5,6,7 (sub threads of cores 1,2,3)<br> <br> </div> <div>Amd cards seems more affected by DPC than nvidia ones.<br> </div> <div><br> </div> Note an interesting thing:<br> <br> <a moz-do-not-send="true" href="http://www.guru3d.com/articles-pages/rise-of-the-tomb-raider-pc-graphics-performance-benchmark-review,9.html" target="_blank">http://www.guru3d.com/articles-pages/rise-of-the-tomb-raider-pc-graphics-performance-benchmark-review,9.html</a><br> <br> </div> amd and multi cores is... erratic :)</div> <div class="gmail_extra"><br clear="all"> <div> <div class="gmail_signature"> <div dir="ltr">-- <div>Deldycke Quentin<br> </div> <div> <div><br> </div> </div> </div> </div> </div> <br> <div class="gmail_quote">On 26 February 2016 at 09:53, Rokas Kupstys <span dir="ltr"><<a moz-do-not-send="true" href="mailto:rokups@zoho.com" target="_blank">rokups@zoho.com</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <div bgcolor="#FFFFFF" text="#000000"> 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.. <div> <div class="h5"><br> <br> <div>On 2016.02.26 10:51, Quentin Deldycke wrote:<br> </div> <blockquote type="cite"> <div dir="ltr"> <div> <div> <div> <div>For my part:<br> <br> </div> debian with some experimental package. When new kernel is out, i recompile it with some difference in config.<br> <br> </div> But right now, 4.5 rc4.<br> <br> </div> No problem with the host since ages. Plasma is buggy but... i think on every distro xD<br> <br> </div> </div> <div class="gmail_extra"><br clear="all"> <div> <div> <div dir="ltr">-- <div>Deldycke Quentin<br> </div> <div> <div><br> </div> </div> </div> </div> </div> <br> <div class="gmail_quote">On 26 February 2016 at 09:43, Stein van Broekhoven <span dir="ltr"><<a moz-do-not-send="true" href="mailto:stein@aapjeisbaas.nl" target="_blank"><a class="moz-txt-link-abbreviated" href="mailto:stein@aapjeisbaas.nl">stein@aapjeisbaas.nl</a></a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Dear All,<br> <br> What do you consider the distro of choice for a stable vm gaming build?<br> At the moment I'm on solus because it has 4.4.0 kernel by default and I like the project.<br> Got libvirtd & virsh working with qemu but just can't get passthrough to work as of now.<br> <br> I have a :<br> ASUS SABERTOOTH 990FX v1 with FX-8120<br> Ati Radeon 6xxx<br> Ati Radeon 5xxx<br> <br> I had it working at some point with ubuntu but that is some time ago and don't remember how.<br> <br> <br> Kind regards,<br> <br> Stein van Broekhoven / System administrator<br> <a moz-do-not-send="true" href="mailto:stein@aapjeisbaas.nl" target="_blank">stein@aapjeisbaas.nl</a><br> <br> _______________________________________________<br> vfio-users mailing list<br> <a moz-do-not-send="true" href="mailto:vfio-users@redhat.com" target="_blank">vfio-users@redhat.com</a><br> <a moz-do-not-send="true" href="https://www.redhat.com/mailman/listinfo/vfio-users" rel="noreferrer" target="_blank">https://www.redhat.com/mailman/listinfo/vfio-users</a><br> </blockquote> </div> <br> </div> <br> <fieldset></fieldset> <br> <pre>_______________________________________________ vfio-users mailing list <a moz-do-not-send="true" href="mailto:vfio-users@redhat.com" target="_blank">vfio-users@redhat.com</a> <a moz-do-not-send="true" href="https://www.redhat.com/mailman/listinfo/vfio-users" target="_blank">https://www.redhat.com/mailman/listinfo/vfio-users</a> </pre> </blockquote> <br> </div> </div> </div> <br> _______________________________________________<br> vfio-users mailing list<br> <a moz-do-not-send="true" href="mailto:vfio-users@redhat.com">vfio-users@redhat.com</a><br> <a moz-do-not-send="true" href="https://www.redhat.com/mailman/listinfo/vfio-users" rel="noreferrer" target="_blank">https://www.redhat.com/mailman/listinfo/vfio-users</a><br> <br> </blockquote> </div> <br> </div> <br> <fieldset class="mimeAttachmentHeader"></fieldset> <br> <pre wrap="">_______________________________________________ vfio-users mailing list <a class="moz-txt-link-abbreviated" href="mailto:vfio-users@redhat.com">vfio-users@redhat.com</a> <a class="moz-txt-link-freetext" href="https://www.redhat.com/mailman/listinfo/vfio-users">https://www.redhat.com/mailman/listinfo/vfio-users</a> </pre> </blockquote> <br> </body> </html>