On 08/18/2014 07:42 PM, William Dauchy wrote: > Hello, > > Using qemu2.1.0, a linux v3.14.X x86_64 as host and a linux v3.12.X x86_64 as > guest > I'm starting a VM with these network interfaces: > > [netdev "vifA.0"] > type = "tap" > vhost = "on" > ifname = "vifA.0" > downscript = "no" > script = "no" > queues = "2" > > [device "vifA.0"] > driver = "virtio-net-pci" > netdev = "vifA.0" > mac = "00:16:3e:1a:4e:11" > mq = "on" > vectors = "5" > > (and same config for two other interfaces but with a different MAC address) > > In the error message I'm getting during startup: > unable to start vhost net: 95: falling back on userspace virtio
What's the qemu command line for your testing? I try simple command line with 3 mq cards in qemu 2.1. Everything works fine. > I saw that it's failing in `vhost_dev_start` where `vhost_dev_set_features` > is returning an error. > r = vhost_dev_set_features(hdev, hdev->log_enabled); > I'm hitting the issue starting from three interfaces, i.e no problem with one > or two. > I also don't have the issue with disabling multi queue. > > Am I wrong on something? What can I do to help debug this situation? > > Regards, Is this a regression? If yes, you can probably bisect to find the first bad commit. Thanks
