D45311.id138952.diff
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	diff --git a/sys/dev/nvme/nvme_ns.c b/sys/dev/nvme/nvme_ns.c
	--- a/sys/dev/nvme/nvme_ns.c
	+++ b/sys/dev/nvme/nvme_ns.c
	@@ -428,6 +428,7 @@
	if (child_bios == NULL)
	return (ENOMEM);

	+ atomic_add_long(&ns->ctrlr->alignment_splits, 1);
	for (i = 0; i < num_bios; i++) {
	child = child_bios[i];
	err = nvme_ns_bio_process(ns, child, nvme_bio_child_done);
	diff --git a/sys/dev/nvme/nvme_private.h b/sys/dev/nvme/nvme_private.h
	--- a/sys/dev/nvme/nvme_private.h
	+++ b/sys/dev/nvme/nvme_private.h
	@@ -317,6 +317,9 @@
	bus_dmamap_t hmb_desc_map;
	struct nvme_hmb_desc *hmb_desc_vaddr;
	uint64_t hmb_desc_paddr;
	+
	+ /* Statistics */
	+ long alignment_splits;
	};

	#define nvme_mmio_offsetof(reg) \
	diff --git a/sys/dev/nvme/nvme_sysctl.c b/sys/dev/nvme/nvme_sysctl.c
	--- a/sys/dev/nvme/nvme_sysctl.c
	+++ b/sys/dev/nvme/nvme_sysctl.c
	@@ -419,4 +419,8 @@
	nvme_sysctl_initialize_queue(&ctrlr->ioq[i], ctrlr_ctx,
	que_tree);
	}
	+
	+ SYSCTL_ADD_LONG(ctrlr_ctx, ctrlr_list, OID_AUTO, "alignment_splits",
	+ CTLFLAG_RD, &ctrlr->alignment_splits,
	+ "Number of times we split the I/O in a namespace to get better alignment");
	}