Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!killer!ames!pasteur!ucbvax!UTDALVM1.BITNET!LIPPKE From: LIPPKE@UTDALVM1.BITNET (David Lippke) Newsgroups: comp.protocols.tcp-ip Subject: TCP simulator wanted Message-ID: <8807100545.AA19765@ucbvax.Berkeley.EDU> Date: 9 Jul 88 04:33:47 GMT Sender: daemon@ucbvax.BERKELEY.EDU Organization: The Internet Lines: 26 We've recently put some effort into benchmarking various combinations of TCP/IP software and ethernet controllers on IBM mainframes running VM. The results of this testing have now been analyzed to death and we're preparing for a second series of tests later this year. Most of the performance problems of the current software/hardware in this area are related to a long latency from packet reception to the processing of that packet by the software (i.e., this latency tends to be much greater than the transmit-commit to network latency). I'm currently trying to quantify the effect that cutting one latency or another will have on TCP performance. I think I may be homing in on some decent conclusions and I plan on creating some live tests, but it would be much easier to try out my theories if I had access to some software which would simulate two interconnected TCPs. I'm not after anything too complex; something that will simulate a single established connection and let me adjust various parameters would be a useful starting point. Anyone have something even remotely applicable? Kind Regards, David Lippke The University of Texas at Dallas 214-690-2632