Index: /trunk/src/VBox/HostDrivers/Support/win/SUPDrv-win.cpp
===================================================================
--- /trunk/src/VBox/HostDrivers/Support/win/SUPDrv-win.cpp	(revision 24034)
+++ /trunk/src/VBox/HostDrivers/Support/win/SUPDrv-win.cpp	(revision 24035)
@@ -325,10 +325,4 @@
         int rc = supdrvIOCtlFast(ulCmd, (unsigned)(uintptr_t)pIrp->UserBuffer /* VMCPU id */, pDevExt, pSession);
 #else
-# if 1 /* experiment */
-        /* Prevent Windows from rescheduling us to another CPU/core. */
-        KeSetSystemAffinityThread((KAFFINITY)1 << KeGetCurrentProcessorNumber());
-        int rc = supdrvIOCtlFast(ulCmd, (unsigned)(uintptr_t)pIrp->UserBuffer /* VMCPU id */, pDevExt, pSession);
-        KeSetSystmeAffinityThread(KeQueryActiveProcessors());
-# else /* old code */
         /* Raise the IRQL to DISPATCH_LEVEL to prevent Windows from rescheduling us to another CPU/core. */
         Assert(KeGetCurrentIrql() <= DISPATCH_LEVEL);
@@ -337,5 +331,4 @@
         int rc = supdrvIOCtlFast(ulCmd, (unsigned)(uintptr_t)pIrp->UserBuffer /* VMCPU id */, pDevExt, pSession);
         KeLowerIrql(oldIrql);
-# endif
 #endif