virtio nic configure multi-queue¶
virtio虚拟出来的网卡默认是单队列的，ip link 显示如下。 多核系统下，单队列要要阻塞收发， 影响性能， 多队列可以并发，内核也支持（TUN/TAP）。这里记录开启多队列的方式。 因为virtio的限制，队列最大256个。
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
link/ether 52:54:00:16:b5:50 brd ff:ff:ff:ff:ff:ff
libvirt 或者 virsh 修改网卡xml文件¶
<interface type='network'>
<source network='default'/>
<model type='virtio'/>
+ <driver name='vhost' queues='N'/>
</interface>
qemu¶
qemu-kvm -netdev tap,id=hn0,queues=N -device virtio-net-pci,netdev=hn0,vectors=2M+2 ...
openstack¶
openstack image set <IMG_ID> --property hw_vif_multiqueue_enabled=true
验证¶
ip link 的输出多了mq
$ ip link
2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP mode DEFAULT group default qlen 1000
$ ethtool -l enp1s0
Channel parameters for enp1s0:
Pre-set maximums:
RX: 0
TX: 0
Other: 0
Combined: 256
Current hardware settings:
RX: 0
TX: 0
Other: 0
Combined: 40
参考¶
https://docs.paloaltonetworks.com/vm-series/10-1/vm-series-deployment/set-up-the-vm-series-firewall-on-kvm/performance-tuning-of-the-vm-series-for-kvm/enable-multi-queue-support-for-nics-on-kvm https://cloud.vk.com/docs/en/computing/iaas/how-to-guides/vm-multiqueue https://www.linux-kvm.org/page/Multiqueue