On Wed, Oct 06, 2021 at 05:13:28PM -0600, Jens Axboe wrote:

Particularly for NVMe with efficient deferred submission for many
requests, there are nice benefits to be seen by bumping the default max
plug count from 16 to 32. This is especially true for virtualized setups,
where the submit part is more expensive. But can be noticed even on
native hardware.

It might be worth to throw in a comment how ths value was chosen.

Otherwise this looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>