Date: Fri, 28 Apr 1995 11:27:29 -0700 From: Rick Jones <raj@hpisrdq.cup.hp.com> To: bugs@FreeBSD.org Subject: Possible bug in the 4/12 TCP Message-ID: <9504281827.AA05655@hpisrdq.cup.hp.com>
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Here is the original message, with my typo... rick jones To: Andras Olah <olah@cs.utwente.nl> Cc: rstevens@noao.edu (Richard Stevens), bugs@frteebsd.org Subject: Bug?: immediate ACK's in 4/12 TCP... Date: Fri, 28 Apr 1995 11:23:37 -0700 From: Rick Jones <raj@hpisrdq.cup.hp.com> Andras - Thanks for the copy of tclient and tserver. They confirm something that I have noticed with netperf (which I have working again with minor tweaks to netperf.c and netserver.c so that a TCP_TRR test calls the tran routines and not the conn routines - what's RCS anyway :) There is (what I think is) a bug in the 4/12 TCP, of unknown origin. It is immediately ACKing *all* traffic. I have analyser traces of netperf TCP_RR, TCP_TRR, TCP_CRR, and TCP_STREAM tests which show this behaviour. I'm going to try to find time to look through the source to see if I can find the bug. I think I'll also ask bugs@freebsd.org if any other changes were added to TCP for the 4/12 snapshot to try and narrow my search. Bugs - what were the changes in the TCP code between the 3/22 and 4/12 snapshots? For TCP_RR, it means a 2x increase in packets per transaction, for TCP_TRR, things go from three packets per transaction to five. For a TCP_STREAM test, it is a 33% increase in packets. I suspect that it can be seen with just about *any* TCP connection - telnet, ftp, etc...I expect to have the 2.0PL1 netperf on ftp.cup.hp.com by Monday. later, rick ------- =_aaaaaaaaaa--
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