Messages in this thread Patch in this message | | | From | Theodore Ts'o <> | Subject | [PATCH] virtio-blk: make the queue depth configurable | Date | Fri, 14 Mar 2014 13:31:03 -0400 |
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The current virtio block sets a queue depth of 64. With a sufficiently fast device, using a queue depth of 256 can double the IOPS which can be sustained. So make the queue depth something which can be set at module load time or via a kernel boot-time parameter.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: virtio-dev@lists.oasis-open.org Cc: virtualization@lists.linux-foundation.org Cc: fes@google.com --- drivers/block/virtio_blk.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 6a680d4..0c9e57f 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -481,6 +481,9 @@ static struct blk_mq_ops virtio_mq_ops = { .free_hctx = blk_mq_free_single_hw_queue, }; +static int queue_depth = 64; +module_param(queue_depth, int, 444); + static struct blk_mq_reg virtio_mq_reg = { .ops = &virtio_mq_ops, .nr_hw_queues = 1, @@ -551,6 +554,7 @@ static int virtblk_probe(struct virtio_device *vdev) goto out_free_vq; } + virtio_mq_reg.queue_depth = queue_depth; virtio_mq_reg.cmd_size = sizeof(struct virtblk_req) + sizeof(struct scatterlist) * sg_elems; -- 1.9.0
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