nvme: default to 0 poll queues

We need a better way of configuring this, and given that polling is
(still) a bit niche, let's default to using 0 poll queues. That way
we'll have the same read/write/poll behavior as 4.20, and users that
want to test/use polling are required to do manual configuration of the
number of poll queues.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index 89874e23e42295f17a7ec1713c41e106c1b832ca..57e790391b82add712aa7f35eb6ef7e06076562c 100644 (file)
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -86,7 +86,7 @@ MODULE_PARM_DESC(write_queues,
        "Number of queues to use for writes. If not set, reads and writes "
        "will share a queue set.");
 
-static int poll_queues = 1;
+static int poll_queues = 0;
 module_param_cb(poll_queues, &queue_count_ops, &poll_queues, 0644);
 MODULE_PARM_DESC(poll_queues, "Number of queues to use for polled IO.");