<HTML><HEAD> <META content="text/html; charset=utf-8" http-equiv=Content-Type></HEAD> <BODY> <DIV> <DIV style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif">Hi, I'm not sure if it's the device, as long as it just shows a black screen with a blinking underscore. Some times waiting long some text regarding to the boot loader comes. I'll try it with 2.4 using different scenarios and come back with the results this evening. Thanks Alex! José.</DIV></DIV> <DIV dir=ltr> <HR> From: <A href="mailto:alex.williamson@redhat.com">Alex Williamson</A> Sent: ‎13/‎08/‎2015 22:23 To: <A href="mailto:koalinux@gmail.com">José Ramón Muñoz Pekkarinen</A> Cc: <A href="mailto:vfio-users@redhat.com">vfio-users@redhat.com</A> Subject: Re: [vfio-users] Qemu 2.3 slow </DIV>On Thu, 2015-08-13 at 22:05 +0300, José Ramón Muñoz Pekkarinen wrote: > Hi, > > Do anyone use qemu-2.3 for vfio passthrough? I tried it and it > considerably slowdown the startup of the machine at unusable point, so I don't > really know if it's just my setup. Unless something is incredibly wrong, like not enabling KVM, the performance of an assigned device is fairly well independent of QEMU. The whole idea of device assignment is to have as little interaction with the hypervisor as possible. If the slowdown is unrelated to the assigned device, you should try QEMU 2.4 and report the issue to the QEMU lists. Thanks, Alex </BODY></HTML>