By default on every Linux distro after installing QEMU and libvirt two kinds of networking are available: NAT: VM sits behind a NAT. MACVTAP: without going into much details it acts more or less like a bridged network, except not really. One of the most annoying limitations is that host to guest communication and vice versa are not really working well. Other important things might be broken as well, like for example VRRP. …

Today I red an article that was comparing Fedora 29 and FreeBSD 11.2 network performance in a KVM/Qemu environment. Since I use KVM/Qemu and also Fedora and Freebsd I powered on a couple of vm and did my own tests. Results are quite interesting, I expected FreeBSD to be faster but it turns out Fedora 29 actually is. Host system configuration: CPU: Ryzen 7 1700x @4 GHz Motherboard: Gigabyte X370 K7 - BIOS F23d RAM: 2x16 GB DDR4 @3133 MHz CAS 16 HDD: Some Samsung SSD Operating systems Host: Fedora 29 x86_64 Fedora VM0: Fedora 29 X86_64 Fedora VM1: Fedora 29 X86_64 FreeBSD VM0: FreeBSD 11. …

It’s summer, it’s hot as hell, I am back home from mountains and I’ve plenty of free time. Between a barbecue and the next one I spend my time playing with and learning new stuff: this week new stuff is called QEMU-KVM. Yesterday I also tried XenServer but to be honest I wasn’t impressed, it just look like to be an old version of CentOS minimal install with some custom repos and a fancy GUI. …