On 02/20/16 01:42, Hannes Reinecke wrote: > ATM the only SCSI driver to support SCSI-mq properly are lpfc, virtio, > and fnic. None of the other driver have been modified, and I suspect the > performance might be less than stellar. Hello Hannes, Before scsi-mq support was added to the above drivers it was added to the ib_srp driver. Apparently today there are multiple drivers that support multiple hardware queues: $ git grep -nH 'nr_hw_queues = [^1]' | grep -vE 'block/blk-mq|scsi/scsi_lib' drivers/block/null_blk.c:667: nullb->tag_set.nr_hw_queues = submit_queues; drivers/block/virtio_blk.c:638: vblk->tag_set.nr_hw_queues = vblk->num_vqs; drivers/block/xen-blkfront.c:927: info->tag_set.nr_hw_queues = info->nr_rings; drivers/infiniband/ulp/srp/ib_srp.c:3337: target->scsi_host->nr_hw_queues = target->ch_count; drivers/nvme/host/pci.c:1680: dev->tagset.nr_hw_queues = dev->online_queues - 1; drivers/scsi/lpfc/lpfc_init.c:3318: shost->nr_hw_queues = phba->cfg_fcp_io_channel; drivers/scsi/virtio_scsi.c:1008: shost->nr_hw_queues = num_queues; Performance data is available in http://events.linuxfoundation.org/sites/events/files/slides/Vault%20-%20scsi-mq%20v2.pdf. Bart. -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
