Liam, The Workbench will show cycles for the microengines and the IX bus, the 'IX bus device status' shows the IX data bus and the status pins, so you can see the cycle count when EOP is asserted, a data watch on the RFIFO elements will show you when the MPKT is written into the RFIFO. I ran the L3fwd8_1f project, this looks like 8 microengine cycles to transfer the MPKT into the RFIFO. Rgds -----Original Message----- From: Liam.Noonan [mailto:Liam.Noonan@ul.ie] Sent: 17 June 2003 12:35 To: 'ixp1200@CS.Princeton.EDU' Subject: [ixp1200] Monitoring the IXBus using Workbench Hi, I am trying to determine the amount of cycles/time required to transfer an Mpacket from an IXF 440 to RFIFO. I have loaded and examined the receive code from chapter 5 in the IXP 1200 book. The history window however displays the information from the microengine point of view. I am interested from both the IXF 440 and RBS point of view the amount of cycles each unit utilises to accomplish this task. Any suggestions as to how I can view this information on workbench would be appreciated. Regards Liam University of Limerick Ireland