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diff --git a/sys/dev/nvme/nvme_ctrlr.c b/sys/dev/nvme/nvme_ctrlr.c
--- a/sys/dev/nvme/nvme_ctrlr.c
+++ b/sys/dev/nvme/nvme_ctrlr.c
@@ -1442,6 +1442,8 @@
ctrlr->enable_aborts = 0;
TUNABLE_INT_FETCH("hw.nvme.enable_aborts", &ctrlr->enable_aborts);
+ ctrlr->alignment_splits = counter_u64_alloc(M_WAITOK);
+
/* Cap transfers by the maximum addressable by page-sized PRP (4KB pages -> 2MB). */
ctrlr->max_xfer_size = MIN(maxphys, (ctrlr->page_size / 8 * ctrlr->page_size));
if (nvme_ctrlr_construct_admin_qpair(ctrlr) != 0)
@@ -1560,6 +1562,9 @@
ctrlr->resource_id, ctrlr->resource);
nores:
+ if (ctrlr->alignment_splits)
+ counter_u64_free(ctrlr->alignment_splits);
+
mtx_destroy(&ctrlr->lock);
}
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);
+ counter_u64_add(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
@@ -32,6 +32,7 @@
#include <sys/param.h>
#include <sys/bio.h>
#include <sys/bus.h>
+#include <sys/counter.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/malloc.h>
@@ -317,6 +318,9 @@
bus_dmamap_t hmb_desc_map;
struct nvme_hmb_desc *hmb_desc_vaddr;
uint64_t hmb_desc_paddr;
+
+ /* Statistics */
+ counter_u64_t 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
@@ -30,6 +30,7 @@
#include "opt_nvme.h"
#include <sys/param.h>
+#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/sysctl.h>
@@ -419,4 +420,8 @@
nvme_sysctl_initialize_queue(&ctrlr->ioq[i], ctrlr_ctx,
que_tree);
}
+
+ SYSCTL_ADD_COUNTER_U64(ctrlr_ctx, ctrlr_list, OID_AUTO, "alignment_splits",
+ CTLFLAG_RD, &ctrlr->alignment_splits,
+ "Number of times we split the I/O alignment for drives with preferred alignment");
}

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