[vfio-users] Stutter in games

[Alex Williamson]

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On Mon, Jan 23, 2017 at 11:30 AM, <itvend at gmail.com> wrote:

> I have no clue what to Google even. All cpu pinning topics are for virt
>

isolcpus
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/admin-guide/kernel-parameters.txt#n1669

libvirt vcpu pinning
https://libvirt.org/formatdomain.html#elementsCPUTuning

libvirt hugepage support
https://libvirt.org/formatdomain.html#elementsMemoryTuning

man irqbalance

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,

Alex



>
> *Saatja: *Alex Williamson <alex.l.williamson at gmail.com>
> *Saadetud: *esmaspäev, 23. jaanuar 2017 19:18
> *Adressaat: *Tiit Talts <itvend at gmail.com>
> *Koopia: *vfio-users <vfio-users at redhat.com>
> *Teema: *Re: [vfio-users] Stutter in games
>
>
>
> [re-adding vfio-users]
>
>
>
> On Mon, Jan 23, 2017 at 10:11 AM, <itvend at gmail.com> wrote:
>
> QEMU command is :
>
>
>
> #!/bin/bash
>
>
>
> ## PARAMS        ##############################
> ##############################
>
> CMD="-name vm2 -enable-kvm"
>
> CMD="$CMD -machine type=pc,accel=kvm,kernel_irqchip=on,mem-merge=off"
>
>
>
> CMD="$CMD -rtc base=localtime,clock=host,driftfix=none"
>
>
>
> CMD="$CMD -drive if=pflash,format=raw,readonly,file=/usr/share/ovmf/OVMF_
> CODE.fd"
>
> CMD="$CMD -drive if=pflash,format=raw,file=/root/vm/vm2.fd"
>
>
>
> ## CPU                 ############################################################
> +nx
>
> CMD="$CMD -cpu host,kvm=off,hv_time,hv_relaxed,hv_vapic,hv_spinlocks=
> 0x1fff,hv_vendor_id=Nvidia43FIX -smp cores=6"
>
>
>
> ## MEM                              ##############################
> ##############################
>
> CMD="$CMD -m $((8*1024))"  ## HOST HAS 16GB
>
>
>
> ## PCI-E               ##############################
> ##############################
>
> CMD="$CMD -device vfio-pci,host=01:00.0,multifunction=on"
>
> CMD="$CMD -device vfio-pci,host=01:00.1"
>
>
>
> CMD="$CMD -device vfio-pci,host=02:00.0" ## USB 3.0 EATRON
>
> CMD="$CMD -device vfio-pci,host=04:00.0" ## USB 3.0 EATRON
>
>
>
> ## NET                 ##############################
> ##############################
>
> CMD="$CMD -net nic,model=virtio -net bridge,br=bridge0"
>
>
>
> ## DRIVES           ##############################
> ##############################
>
> CMD="$CMD -device virtio-blk-pci,drive=device_blk_one"
>
> CMD="$CMD -drive file=/dev/mapper/debian--vg-windows,format=raw,if=none,
> aio=native,cache.direct=on,cache=none,id=device_blk_one"
>
>
>
> ## OTHER            ##############################
> ##############################
>
> CMD="$CMD -monitor stdio"
>
> CMD="$CMD -display none"
>
> CMD="$CMD -vga none"
>
> CMD="$CMD -nodefaults -nodefconfig"
>
>
>
> ## STAR OF THE SHOW
>
> qemu-system-x86_64 $CMD
>
>
>
>
>
> 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.
>
>
>
>
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