X-Git-Url: http://git.annexia.org/?p=virt-top.git;a=blobdiff_plain;f=virt-top%2Fvirt-top.pod;h=4d7df4ec90180d836ff74f8068e1b84263995836;hp=2588805ef8c0b8f794ad808b3c2a1d1027c87695;hb=4e1409917c38f8bf57838f5119f58edbcad41937;hpb=d24e39fd4ba4dee11674a319bb6bbdd5d2be995c

diff --git a/virt-top/virt-top.pod b/virt-top/virt-top.pod
index 2588805..4d7df4e 100755
--- a/virt-top/virt-top.pod
+++ b/virt-top/virt-top.pod
@@ -365,11 +365,25 @@ init file.
 
 =back
 
-
 Note that in the current implementation, options specified in
 the init file override options specified on the command line.
 This is a bug and this behaviour may change in the future.
 
+=head1 NOTES
+
+=head2 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.
+
 =head1 SEE ALSO
 
 L<top(1)>,