<div dir="ltr">I had the same issues and I solved them by installing Windows 10 on bare metal. I am really interested if there is a fix for this. From my research, (I've spent 2 full months in trying to find all kinds of causes and fixes) I've just come to the conclusion that somehow the AMD CPU and/or the Motherboard IOMMU is the root cause and you just can't fix it from the configuration side of things. I guess it would also be hard to provide a fix for QEMU/Kernel KVM since there is no easy way to reproduce it, or by the fact that mostly everything is optimized for the Intel platform.<div><br></div><div>My Configuration: AMD FX-8320, 990FXA-UD3 (Rev. 3.0), GTX 970.<br><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 23, 2017 at 8:02 PM, Alex Williamson <span dir="ltr"><<a href="mailto:alex.l.williamson@gmail.com" target="_blank">alex.l.williamson@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">[Please copy the mailing list, use reply-all. The mailing list is not intended to spawn private conversations]<div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 23, 2017 at 11:30 AM, <span dir="ltr"><<a href="mailto:itvend@gmail.com" target="_blank">itvend@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="ET"><div class="m_2382996401186003540gmail-m_-2794782374360300466WordSection1"><p class="MsoNormal">I have no clue what to Google even. All cpu pinning topics are for virt</p></div></div></blockquote><div><br></div><div>isolcpus</div><div><a href="http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/kernel-parameters.txt#n1669" target="_blank">http://git.kernel.org/cgit/<wbr>linux/kernel/git/torvalds/<wbr>linux.git/tree/Documentation/<wbr>admin-guide/kernel-parameters.<wbr>txt#n1669</a><br></div><div><br></div><div>libvirt vcpu pinning</div><div><a href="https://libvirt.org/formatdomain.html#elementsCPUTuning" target="_blank">https://libvirt.org/<wbr>formatdomain.html#<wbr>elementsCPUTuning</a><br></div><div><br></div><div>libvirt hugepage support</div><div><a href="https://libvirt.org/formatdomain.html#elementsMemoryTuning" target="_blank">https://libvirt.org/<wbr>formatdomain.html#<wbr>elementsMemoryTuning</a><br></div><div><br></div><div>man irqbalance</div><div><br></div><div>If you intend to continue using the QEMU commandline directly, be prepared to do your own research, libvirt is common way to do these things. Thanks,</div><div><br></div><div>Alex</div><div><br></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="ET"><div class="m_2382996401186003540gmail-m_-2794782374360300466WordSection1"><span class="m_2382996401186003540gmail-"><p class="MsoNormal"> <u></u></p></span><div style="border-right:none;border-bottom:none;border-left:none;border-top:1pt solid rgb(225,225,225);padding:3pt 0cm 0cm"><p class="MsoNormal" style="border:none;padding:0cm"><b>Saatja: </b><a href="mailto:alex.l.williamson@gmail.com" target="_blank">Alex Williamson</a><br><b>Saadetud: </b>esmaspäev, 23. jaanuar 2017 19:18<span class="m_2382996401186003540gmail-"><br><b>Adressaat: </b><a href="mailto:itvend@gmail.com" target="_blank">Tiit Talts</a><br><b>Koopia: </b><a href="mailto:vfio-users@redhat.com" target="_blank">vfio-users</a><br><b>Teema: </b>Re: [vfio-users] Stutter in games</span></p></div><div><div class="h5"><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">[re-adding vfio-users]</p><div><div class="m_2382996401186003540gmail-h5"><div><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">On Mon, Jan 23, 2017 at 10:11 AM, <<a href="mailto:itvend@gmail.com" target="_blank">itvend@gmail.com</a>> wrote:</p><blockquote style="border-top:none;border-right:none;border-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin-left:4.8pt;margin-right:0cm"><div><div><p class="MsoNormal">QEMU command is :</p><p class="MsoNormal"> </p><p class="MsoNormal">#!/bin/bash</p><p class="MsoNormal"> </p><p class="MsoNormal">## PARAMS ##############################<wbr>##############################</p><p class="MsoNormal">CMD="-name vm2 -enable-kvm"</p><p class="MsoNormal">CMD="$CMD -machine type=pc,accel=kvm,kernel_irqch<wbr>ip=on,mem-merge=off"</p><p class="MsoNormal"> </p><p class="MsoNormal">CMD="$CMD -rtc base=localtime,clock=host,drif<wbr>tfix=none"</p><p class="MsoNormal"> </p><p class="MsoNormal">CMD="$CMD -drive if=pflash,format=raw,readonly,<wbr>file=/usr/share/ovmf/OVMF_CODE<wbr>.fd"</p><p class="MsoNormal">CMD="$CMD -drive if=pflash,format=raw,file=/roo<wbr>t/vm/vm2.fd"</p><p class="MsoNormal"> </p><p class="MsoNormal">## CPU ##############################<wbr>############################## +nx</p><p class="MsoNormal">CMD="$CMD -cpu host,kvm=off,hv_time,hv_relaxe<wbr>d,hv_vapic,hv_spinlocks=0x1fff<wbr>,hv_vendor_id=Nvidia43FIX -smp cores=6"</p><p class="MsoNormal"> </p><p class="MsoNormal">## MEM ##############################<wbr>##############################</p><p class="MsoNormal">CMD="$CMD -m $((8*1024))" ## HOST HAS 16GB</p><p class="MsoNormal"> </p><p class="MsoNormal">## PCI-E ##############################<wbr>##############################</p><p class="MsoNormal">CMD="$CMD -device vfio-pci,host=01:00.0,multifun<wbr>ction=on"</p><p class="MsoNormal">CMD="$CMD -device vfio-pci,host=01:00.1"</p><p class="MsoNormal"> </p><p class="MsoNormal">CMD="$CMD -device vfio-pci,host=02:00.0" ## USB 3.0 EATRON</p><p class="MsoNormal">CMD="$CMD -device vfio-pci,host=04:00.0" ## USB 3.0 EATRON</p><p class="MsoNormal"> </p><p class="MsoNormal">## NET ##############################<wbr>##############################</p><p class="MsoNormal">CMD="$CMD -net nic,model=virtio -net bridge,br=bridge0"</p><p class="MsoNormal"> </p><p class="MsoNormal">## DRIVES ##############################<wbr>##############################</p><p class="MsoNormal">CMD="$CMD -device virtio-blk-pci,drive=device_bl<wbr>k_one"</p><p class="MsoNormal">CMD="$CMD -drive file=/dev/mapper/debian--vg-wi<wbr>ndows,format=raw,if=none,aio=<wbr>native,cache.direct=on,cache=<wbr>none,id=device_blk_one"</p><p class="MsoNormal"> </p><p class="MsoNormal">## OTHER ##############################<wbr>##############################</p><p class="MsoNormal">CMD="$CMD -monitor stdio"</p><p class="MsoNormal">CMD="$CMD -display none"</p><p class="MsoNormal">CMD="$CMD -vga none"</p><p class="MsoNormal">CMD="$CMD -nodefaults -nodefconfig"</p><p class="MsoNormal"> </p><p class="MsoNormal">## STAR OF THE SHOW</p><p class="MsoNormal">qemu-system-x86_64 $CMD</p><p class="MsoNormal"><u></u> <u></u></p></div></div></blockquote><div><p class="MsoNormal"><u></u> <u></u></p></div></div></div></div></div></div><div><div class="m_2382996401186003540gmail-h5"><p class="MsoNormal">So the good news is you're already leaving 2 cores for the host, the bad news is that the next level of tuning you need to do is very difficult when using QEMU directly from the commandline. libvirt makes is so much easier. </p><p class="MsoNormal"><u></u> <u></u></p></div></div></div></div></div>
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