On Wed, Aug 1, 2012 at 6:05 PM, Bernd Schubert <bernd.schubert@xxxxxxxxxxxxxxxxxx> wrote: > On 07/31/2012 12:23 PM, Stefan Hajnoczi wrote: >> >> On Mon, Jul 30, 2012 at 7:08 PM, Bernd Schubert > > >>> >>> I took a quick glance where skb_recv_done is registered at all and traced >>> it >>> back to vp_find_vqs(). Looking into that function I noticed MSI and so >>> tried >>> to boot with pci=nomsi. And indeed I guessed it right, with pci=nomsi I >>> don't get any lockups anymore. >>> Am I the only one booting kvm-qemu usually with enabled MSI? >> >> >> MSI enabled is good and is the default with modern qemu-kvm + guest OSes. >> >> Michael: Any ideas? > > > I just tried to boot with -net...,vectors=0 and -net...,vectors=32, both > time it locks up. So MSI-X vs. MSI does not make a difference. > > I don't have any time to further track that down right now. Shall I open a > bugzilla ticket so that it won't be forgotten? > And I also tend to make a simple patch to let virtio-net always use normal > interrupts as users usually don't like lock ups... But then I still don't > understand why I seem to be the only one running into it (or at least I'm > the only one complaining loudly). Filing a bug is a good idea. I haven't seen this MSI reported elsewhere. Stefan -- 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
