diff -r 2b0c5800fb1c -r 259b54092265 src/hotspot/share/gc/shenandoah/heuristics/shenandoahPassiveHeuristics.cpp
--- a/src/hotspot/share/gc/shenandoah/heuristics/shenandoahPassiveHeuristics.cpp	Tue Oct 22 09:20:21 2019 -0700
+++ b/src/hotspot/share/gc/shenandoah/heuristics/shenandoahPassiveHeuristics.cpp	Tue Oct 22 18:53:22 2019 +0200
@@ -29,6 +29,11 @@
 #include "logging/log.hpp"
 #include "logging/logTag.hpp"
 
+ShenandoahPassiveHeuristics::ShenandoahPassiveHeuristics() : ShenandoahHeuristics() {
+  // Passive runs with max speed for allocation, because GC is always STW
+  SHENANDOAH_ERGO_DISABLE_FLAG(ShenandoahPacing);
+}
+
 bool ShenandoahPassiveHeuristics::should_start_gc() const {
   // Never do concurrent GCs.
   return false;