Index: head/sys/cam/cam_iosched.c
===================================================================
--- head/sys/cam/cam_iosched.c
+++ head/sys/cam/cam_iosched.c
@@ -1022,7 +1022,7 @@
 		bioq_init(&(*iscp)->write_queue);
 		(*iscp)->read_bias = 100;
 		(*iscp)->current_read_bias = 100;
-		(*iscp)->quanta = 200;
+		(*iscp)->quanta = min(hz, 200);
 		cam_iosched_iop_stats_init(*iscp, &(*iscp)->read_stats);
 		cam_iosched_iop_stats_init(*iscp, &(*iscp)->write_stats);
 		cam_iosched_iop_stats_init(*iscp, &(*iscp)->trim_stats);