[vfio-users] Stutter in games

[Zachary Boley]

Make sure you pin your cpus and possibly set huge pages, also don't use
qcow2 use raw with no cache and native thread

On Jan 23, 2017 11:18 AM, "Alex Williamson" <alex.l.williamson at gmail.com>
wrote:

> [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="$CMD -cpu host,kvm=off,hv_time,hv_relaxe
>> d,hv_vapic,hv_spinlocks=0x1fff,hv_vendor_id=Nvidia43FIX -smp cores=6"
>>
>>
>>
>> ## MEM                              ##############################
>> ##############################
>>
>> CMD="$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-wi
>> ndows,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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> vfio-users at redhat.com
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>
>
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