You might check out the errata listed at: http://intel.com/intelpress/ixp1200/errata.htm Specifically, Chapter 9, Pages 167, 169, and 170. The transmit code supplied in Chapter 9 does not properly handle packets larger than 64 bytes. You must make two corrections. Lines 169 and 170 should read: port_state.current_data_ptr = (void*)((unsigned int)(port_state.current_data_ptr) + (64 / sizeof(long long))); instead of: port_state.current_data_ptr = (void*)((unsigned int)(port_state.current_data_ptr) + 64); This correction accounts for the quad-word addressing of SDRAM on the IXP1200. Add the following line after line 167: mpacket->eop = 0; This addition ensures the per-mpacket state maintained by the fill threads gets properly initialized for each new packet. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Erik J. Johnson Intel Research & Development erik.j.johnson@intel.com NOT SPEAKING FOR INTEL ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ -----Original Message----- From: ixp1200-bounces@lists.cs.princeton.edu [mailto:ixp1200-bounces@lists.cs.princeton.edu] On Behalf Of Shweta Rao Sent: Friday, November 19, 2004 10:33 AM To: IXP1200 Developer's List Subject: [ixp1200] transmitted packets lose data Hi, in chapter 9 i increased the packet size to 1500 and also enabled the logging. while receiving the packets are intact in the log file as well as sdram but while transmitting the log files show the packets sent are very small with loss of data ie instead of 1500 bytes ,around 64 bytes or little more.Please, can anyone explain why this is happening. Thanks, shweta _______________________________________________ ixp1200 mailing list ixp1200@lists.cs.princeton.edu https://lists.cs.princeton.edu/mailman/listinfo/ixp1200