On Tue, Mar 26, 2019 at 03:55:10PM +0800, luferry wrote: > > > > At 2019-03-26 15:39:54, "Christoph Hellwig" <hch@xxxxxx> wrote: > >Why isn't this using the automatic PCI-level affinity assignment to > >start with? > > When enable virtio-blk with multi queues but with only 2 msix-vector. > vp_dev->per_vq_vectors will be false, vp_get_vq_affintity will return NULL directly > so blk_mq_virtio_map_queues will fallback to blk_mq_map_queues. What is the point of the multiqueue mode if you don't have enough (virtual) MSI-X vectors?
