Index: sys/dev/nvd/nvd.c
===================================================================
--- sys/dev/nvd/nvd.c
+++ sys/dev/nvd/nvd.c
@@ -279,7 +279,18 @@
 	disk->d_sectorsize = nvme_ns_get_sector_size(ns);
 	disk->d_mediasize = (off_t)nvme_ns_get_size(ns);
 	disk->d_delmaxsize = (off_t)nvme_ns_get_size(ns);
-	disk->d_stripesize = nvme_ns_get_stripesize(ns);
+	/*
+	 * Intel NVMe controllers have a slow path for I/Os that span a 128KB
+	 * stripe boundary but ZFS limits ashift, which is derived from
+	 * d_stripesize, to 13 (8KB) so we limit the stripesize reported to
+	 * geom(8) to 4KB.
+	 *
+	 * This may result in a small number of additional I/Os to require
+	 * splitting in nvme(4), however the NVMe I/O path is very efficient
+	 * so these additional I/Os will cause very minimal (if any) difference
+	 * in performance or CPU utilisation.
+	 */
+	disk->d_stripesize = MIN(nvme_ns_get_stripesize(ns), 1<<12);
 
 	if (TAILQ_EMPTY(&disk_head))
 		disk->d_unit = 0;