Index: src/xen_internal.c
===================================================================
RCS file: /data/cvs/libvirt/src/xen_internal.c,v
retrieving revision 1.93
diff -u -r1.93 xen_internal.c
--- src/xen_internal.c	21 Aug 2007 10:08:12 -0000	1.93
+++ src/xen_internal.c	29 Aug 2007 13:10:02 -0000
@@ -1424,11 +1424,17 @@
         long long tx_errs;
         long long tx_drop;
 
+        /* IMPORTANT NOTE!
+         * /proc/net/dev vif<domid>.nn sees the network from the point
+         * of view of dom0 / hypervisor.  So bytes TRANSMITTED by dom0
+         * are bytes RECEIVED by the domain.  That's why the TX/RX fields
+         * appear to be swapped here.
+         */
         if (sscanf (line, "vif%d.%d: %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld %lld",
                     &domid, &port,
-                    &rx_bytes, &rx_packets, &rx_errs, &rx_drop,
-                    &dummy, &dummy, &dummy, &dummy,
                     &tx_bytes, &tx_packets, &tx_errs, &tx_drop,
+                    &dummy, &dummy, &dummy, &dummy,
+                    &rx_bytes, &rx_packets, &rx_errs, &rx_drop,
                     &dummy, &dummy, &dummy, &dummy) != 18)
             continue;