[PATCH] nvme-pci: add module parameter for io queue depth

[Christoph Hellwig]

On Fri, Jul 07, 2017 at 05:05:47PM +0800, weiping zhang wrote:
> Adjust io queue depth more easily.
> 
> Signed-off-by: weiping zhang <zhangweiping at didichuxing.com>

Sounds useful in general, the only thin I'm worried about is that
this will affect all drives in the system, which might have
very different characteristics.  But I can't really think of
a better approach.