On Wed, Oct 31, 2012 at 01:46:22PM +0100, Paolo Bonzini wrote: > qemu-nbd does support AIO in the latest versions. There's also > --cache=MODE and --aio=MODE command-line options.
Oh true, it's just hidden behind coroutines. With --aio-native and --nocache I actually get fairly reasonable performance out of it now. > But if you need a QMP interface, adding it to qemu-nbd would really be a > bad idea. :) I don't nessecarily need QMP, I'm just looking for a way to create a snapshot underneath an exported image. > You can use qtest mode to get very close to this (even if you send > stop/cont by mistake on the monitor, no code will actually run): > > qemu-system-x86_64 -chardev file,id=null,path=/dev/null -qtest null > -machine accel=qtest -m 1 -nodefaults -nographic > > but having a separate do-nothing target would probably be nicer... > though Anthony may have different opinions. That looks fairlt reasonable, thanks.
