Let WaitIfUpstreamIdle spin long enough to stay saturated by load_tester

src/http_handler.hpp

@@ -8,6 +8,7 @@
 
 #include "connection.hpp"
 #include "connection_handler.hpp"
+#include "loop_iterations.h"
 #include "perfetto_categories.hpp"
 #include "server.hpp"
 #include "thread_pipeline.hpp"
@@ -108,7 +109,7 @@ struct HttpHandler : ConnectionHandler {
           if (!c) {
             return;
           }
-          for (volatile int i = 0; i < 1200; i = i + 1)
+          for (volatile int i = 0; i < loopIterations; i = i + 1)
             ;
         }
       }
@@ -152,7 +153,7 @@ private:
   static constexpr int kFinalStageThreads = 2;
   static constexpr int kLogSize = 12;
   StaticThreadPipeline<std::unique_ptr<Connection>,
-                       WaitStrategy::WaitIfStageEmpty, 1, 2>
+                       WaitStrategy::WaitIfUpstreamIdle, 1, 2>
       pipeline{kLogSize};
   std::thread stage0Thread;
   std::vector<std::thread> finalStageThreads;