Actually, it seems like this might be an iperf bug. The man page specifically says:
"The threading implementation is rather heinous." -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1079212 Title: network slow when 2 VMs using virtio net bridged to same pyhs. network device on kvm host To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1079212/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
