--- a/usr/src/uts/common/fs/zfs/dmu_send.c	Thu Apr 29 15:27:29 2010 -0400
+++ b/usr/src/uts/common/fs/zfs/dmu_send.c	Thu Apr 29 13:37:53 2010 -0700
@@ -1181,7 +1181,7 @@
 	}
 
 	if (err = dmu_buf_hold(ref_os, drrwbr->drr_refobject,
-	    drrwbr->drr_refoffset, FTAG, &dbp))
+	    drrwbr->drr_refoffset, FTAG, &dbp, DMU_READ_PREFETCH))
 		return (err);
 
 	tx = dmu_tx_create(os);