Index: uspace/app/tester/ipc/ping_pong.c
===================================================================
--- uspace/app/tester/ipc/ping_pong.c	(revision c74b9de1187f3b60a7db1aad1e1fcd51ae134f24)
+++ uspace/app/tester/ipc/ping_pong.c	(revision ad2cf042bea2029414bd5597a2ce547b208ff957)
@@ -127,5 +127,5 @@
 	}
 
-	double stddev = qd; // XXX sqrt
+	double stddev = qd / (NUM_SAMPLES - 1); // XXX sqrt
 
 	TPRINTF("Average: %.0f rt/s Std.dev^2: %.0f rt/s Samples: %d\n",