[vfio-users] Disk Performance

[Nick Sarnie]

Hi guys,

It seems the biggest limiting factor of my GPU Passthrough setup is the
disk. Does anyone have any tips to optimize it? Also, which is faster,
having the disk with if=virtio, or having the disk with if=none and a
virtio SCSI controller. The raw image is 250GB on a 500GB ext4 hard drive,
which is encrypted with dm-crypt. Below is my current script.

Thanks,
Sarnex


#!/bin/sh
export QEMU_AUDIO_DRV=pa
qemu-system-x86_64 -enable-kvm \
-m 5120 \
-cpu host \
-smp 8,sockets=1,cores=8,threads=1 \
-device vfio-pci,host=01:00.0,x-vga=on,multifunction=on \
-device vfio-pci,host=01:00.1 \
-vga none \
-drive file=/media/500GB/win10.img,id=disk,if=virtio,cache=none,format=raw \
-device vfio-pci,host=00:12.0 \
-device vfio-pci,host=00:12.2 \
-device vfio-pci,host=00:16.0 \
-device vfio-pci,host=00:16.2 \
-soundhw ac97 \
-rtc base=localtime \
-netdev user,id=net0 \
-device virtio-net-pci,netdev=net0 \
-device virtio-scsi-pci,id=scsi
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