FreeBSD networking test results.

SarAsio/network.cpp

@@ -47,6 +47,11 @@
 //       same because the problem is the things Windows is doing, not the
 //       hardware. An NDIS filter driver may end up being a valid alternative to
 //       using RIO.
+//     - FreeBSD netmap results are in. Test setup: 2 machines with Intel
+//       X520-DA2 cards, hw.ix.max_interrupt_rate=0, running nm_ping with
+//       'rtprio 0', with BUSY_WAIT enabled. Average: 10us, worst case: 25us.
+//       With BUSY_WAIT off, worst case is consistently around 300us due to
+//       scheduling delay. These are the values I want to see.
 // - winsock initialization
 // - rio initialization
 // - message send routines
@@ -138,4 +143,4 @@
 // <- open interface
 // <- close interface
 // <- tick
-// <- buffer
+// <- buffer

nm_ping/nm_ping.c

@@ -16,6 +16,7 @@
 #include <arpa/inet.h>
 #include <poll.h>
 
+#define BUSY_WAIT
 #define MAC_FORMAT "%02X:%02X:%02X:%02X:%02X:%02X"
 #define MAC_VALUES(v) (v)[0], (v)[1], (v)[2], (v)[3], (v)[4], (v)[5]
 #define IP4_FORMAT "%d.%d.%d.%d"
@@ -428,6 +429,8 @@ static void clientLoop()
 
             if (iterEnd - iterStart > worstLatency) {
                 worstLatency = iterEnd - iterStart;
+                printf("worst case %08" PRIx64 " %" PRIu64 "us\n",
+                    index, worstLatency / 1000);
             }
         }