On Thu, Jul 22, 2021 at 11:40:19PM +0800, Ming Lei wrote:

On Thu, Jul 22, 2021 at 03:06:09PM +0200, Christoph Hellwig wrote:

quoted

On Thu, Jul 22, 2021 at 05:52:45PM +0800, Ming Lei wrote:
	 and nvme rdma driver can allocate

quoted

+	 * and submit requests on specified hctx via
+	 * blk_mq_alloc_request_hctx

Why does that matter for this setting?

blk_mq_alloc_request_hctx() has been broken for long time, which
can only work if the hctx isn't driven by non-managed irq.

The qla2xxx and lpfc drivers uses managed interrupt.  I'm not quite
sure if the nvme-fc queues directly map to those interrupts, though.