network: 0.940 device: 0.849 mistranslation: 0.786 instruction: 0.744 graphic: 0.732 vnc: 0.612 semantic: 0.571 socket: 0.504 boot: 0.469 other: 0.244 KVM: 0.139 assembly: 0.043 qemu-system-x86_64 -net nic,model=help outputs to stderr instead of std qemu-system-x86_64 -net nic,model=help output comes to stderr instead of std qemu-system-x86_64 -net nic,model=help -> stdout qemu-system-x86_64 -machine help -> stdout qemu-system-x86_64 -cpu help -> stdout as of https://github.com/qemu/qemu/blob/044d65525f6ac2093042ae18dbf8c1300b5c1c18/net/net.c#L831 I run qemu 2.5 on x86_64 kind regards Finally fixed here: https://git.qemu.org/?p=qemu.git;a=commitdiff;h=7b71e03af98fd7b5e1