X-Git-Url: http://git.annexia.org/?p=virt-top.git;a=blobdiff_plain;f=virt-top%2Fvirt-top.txt;h=de0681e2b3c1be2fe181f44e532e4f5388e7f497;hp=da737b8e09ce40bd1e1e7622592f8b469fc7d754;hb=1f3c5a55e0dbbab20fcd23cd81689e0f6ca72669;hpb=3d48ff51cf3447943537639dc6c1a9e5dc5120d2

diff --git a/virt-top/virt-top.txt b/virt-top/virt-top.txt
index da737b8..de0681e 100644
--- a/virt-top/virt-top.txt
+++ b/virt-top/virt-top.txt
@@ -269,6 +269,19 @@ INIT FILE
     file override options specified on the command line. This is a bug and
     this behaviour may change in the future.
 
+NOTES
+  NETWORK RX BYTES AND PACKETS
+    Libvirt/virt-top has no way to know that a packet transmitted to a guest
+    was received (eg. if the guest is not listening). In the network RX
+    stats, virt-top reports the packets transmitted to the guest, on the
+    basis that the guest might receive them.
+
+    In particular this includes broadcast packets. Because of the way that
+    Linux bridges work, if the guest is connected to a bridge, it will
+    probably see a steady "background noise" of RX packets even when the
+    network interface is idle or down. These are caused by STP packets
+    generated by the bridge.
+
 SEE ALSO
     top(1), virsh(1), <http://www.libvirt.org/ocaml/>,
     <http://www.libvirt.org/>, <http://people.redhat.com/~rjones/>,