Index: /trunk/src/VBox/VMM/VMMR3/PDMAsyncCompletion.cpp
===================================================================
--- /trunk/src/VBox/VMM/VMMR3/PDMAsyncCompletion.cpp	(revision 39716)
+++ /trunk/src/VBox/VMM/VMMR3/PDMAsyncCompletion.cpp	(revision 39717)
@@ -1489,6 +1489,6 @@
          * the new limit immediately.
          */
-        ASMAtomicXchgU32(&pBwMgr->cbTransferPerSecMax, cbMaxNew);
-        ASMAtomicXchgU32(&pBwMgr->cbTransferPerSecStart, cbMaxNew);
+        ASMAtomicWriteU32(&pBwMgr->cbTransferPerSecMax, cbMaxNew);
+        ASMAtomicWriteU32(&pBwMgr->cbTransferPerSecStart, cbMaxNew);
     }
     else