Tuning kvm network card?

Question

KVM

Hello!

There is a virtual on kvm + Libvirt . The approximate volume of traffic per second is about 200 megabits. The default network was some kind of Intel, right now I forgot already changed it to Virtio. I loaded the percent on soft-irq by 100%. Changed to Virtio, slept up to 20% approximately. And is it possible to tweak it somehow? Or spread the load across multiple processors? Before that, I had Proxmox. But he slowly died, the ancient one already, and there it was just possible to scatter the load for many percents. And how to do the same on Libvirt.