Hello all, I am using zmq 2.0.6 on Ubuntu 9.04 boxes. I am using PUB/SUB with the epgm protocol. I have one publisher on host A and 5 subscribers on host B. The ZMQ_RATE is set to 100000 on both publishers and subscribers. I do not filter anything on the subscribers side. On the publisher side, I have a ZMQ_HWM set to 100 and ZMQ_LWM set to 50. I am sending 4 kbytes messages. The first byte within each message is a counter which allows me to check that I haven't lost any message.
From the e-mail we exchanged yesterday, I have understood that in order to have some bandwidth available for RDATA pgm packet, I have to add a small "sleep" in my loop sending data to the ZMQ socket. My problem is that even with this sleep, I am still loosing messages! On Wireshark, I now see the RDATA packets nevertheless, I have identified two cases in which I have lost data: 1 - While my sender was re-transmitting packets due to NAK sent by the sender, there was another NAK coming from the sender. Then, the sender stops re-sending the lost packets requested by the first NAK to re-send the packets requested by the second NAK. Therefore, not all the packets requested by the first NAK were re-sent and my application has lost messages. 2 - A more obscure case where during a transmission in which I had NAK and RDATA packets, there was simply a hole in the sequences of sent packets without any NAK packet sent by the recever about this lost packets For both cases, I have saved the wireshark data in a file in case it could be of any interest. Is there someone aware of this kind of problems? Best regards Emmanuel Taurel _______________________________________________ zeromq-dev mailing list zeromq-dev@lists.zeromq.org http://lists.zeromq.org/mailman/listinfo/zeromq-dev
