D33009.1778273356.diff
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	Index: sys/dev/md/md.c
	===================================================================
	--- sys/dev/md/md.c
	+++ sys/dev/md/md.c
	@@ -164,6 +164,9 @@
	static int md_malloc_wait;
	SYSCTL_INT(_vm, OID_AUTO, md_malloc_wait, CTLFLAG_RW, &md_malloc_wait, 0,
	"Allow malloc to wait for memory allocations");
	+static int md_direct;
	+SYSCTL_INT(_vm, OID_AUTO, md_direct, CTLFLAG_RW, &md_direct, 0,
	+ "XXX");

	#if defined(MD_ROOT) && !defined(MD_ROOT_FSTYPE)
	#define MD_ROOT_FSTYPE "ufs"
	@@ -471,10 +474,29 @@
	g_md_start(struct bio *bp)
	{
	struct md_s *sc;
	+ int error;

	sc = bp->bio_to->geom->softc;
	if ((bp->bio_cmd == BIO_READ) \|\| (bp->bio_cmd == BIO_WRITE)) {
	devstat_start_transaction_bio(sc->devstat, bp);
	+ if (md_direct != 0) {
	+ error = sc->start(sc, bp);
	+
	+ /*
	+ * Devstat uses (bio_bcount, bio_resid) for
	+ * determining the length of the completed part
	+ * of the i/o. g_io_deliver() will translate
	+ * from bio_completed to that, but it also
	+ * destroys the bio so we must do our own
	+ * translation.
	+ */
	+ bp->bio_bcount = bp->bio_length;
	+ devstat_end_transaction_bio(sc->devstat, bp);
	+
	+ bp->bio_completed = bp->bio_length - bp->bio_resid;
	+ g_io_deliver(bp, error);
	+ return;
	+ }
	}
	mtx_lock(&sc->queue_mtx);
	bioq_disksort(&sc->bio_queue, bp);