On Fri, Mar 19, 2010 at 03:19:27PM -0700, Sridhar Samudrala wrote: > When creating a guest with 2 virtio-net interfaces, i am running > into a issue causing the 2nd i/f falling back to userpace virtio > even when vhost is enabled. > > After some debugging, it turned out that KVM_IOEVENTFD ioctl() > call in qemu is failing with ENOSPC. > This is because of the NR_IOBUS_DEVS(6) limit in kvm_io_bus_register_dev() > routine in the host kernel. > > I think we need to increase this limit if we want to support multiple > network interfaces using vhost-net. > Is there an alternate solution? > > Thanks > Sridhar Nothing easy that I can see. Each device needs 2 of these. Avi, Gleb, any objections to increasing the limit to say 16? That would give us 5 more devices to the limit of 6 per guest. -- MST -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
