> Subject: [Qemu-devel] [question] virtio-net-device and multi-queue option
>
> Hi,
>
>
> I am currently doing some benchmarks using virtio-net-device using
> virtio-mmio (non PCI) with qemu_system_arm with KVM. Purpose is to
> compare with device passthrough performance.
>
> I heard about the availability of a multi-queue option that greatly
> improves the performance but I currently fail in enabling it.
>
> Please could someone explain me how to turn that feature on? My current
> virtio-net options simply are:
>
> -netdev tap,id=tap0,ifname="tap0" \
> -device virtio-net-device,netdev=tap0
>
There are some steps:
1. create multi-queue netdev device, such as tap device (you can
use "ip tuntap" command, or libvirt), something like as below:
ip tuntap add tap_1 mode tap multi_queue
2. pass corresponding parameters in QEMU command line:
-netdev
type=tap,ifname=tap_q,id=net1,vhost=on,vhostforce=on,queues=4,script= \
-device virtio-net-device,netdev=net1,mq=on,vectors=9
> Also are there any "easy" tunings I can play with to try to reach the
> best performance.
>
You can consider that using irq binding, core binding, vhost-net? etc..
Best regards,
-Gonglei
> Thank you in advance
>
> Best Regards
>
> Eric
