On Tue, Jan 10, 2023 at 11:02 AM Parav Pandit <pa...@nvidia.com> wrote: > > Hi Jason, > > > From: Jason Wang <jasow...@redhat.com> > > Sent: Monday, December 5, 2022 10:25 PM > > > > > A dumb question, any reason we need bother with virtio-net? It looks to me > > it's > > not a must and would complicate migration compatibility. > > Virtio net vdpa device is processing the descriptors out of order. > This vdpa device doesn’t offer IN_ORDER flag. > > And when a VQ is suspended it cannot complete these descriptors as some dummy > zero length completions. > The guest VM is flooded with [1].
Yes, but any reason for the device to do out-of-order for RX? > > So it is needed for the devices that doesn’t offer IN_ORDER feature. > > [1] > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/virtio_net.c?h=v6.2-rc3#n1252 It is only enabled in a debug kernel which should be harmless? Thanks >
