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Re: A new mTCP is available! (version 2020-01-01)

in Milliways
Wrapping this up ... I had a small bug, but fixing it had no effect because it wasn't the root of the problem. If you are running a shim to make an ODI driver look like a packet driver you should specify an MTU of 1500. With the default MTU of 576 many more packets were being generated, and it was …

Re: A new mTCP is available! (version 2020-01-01)

in Milliways
Just a quick update ... Grzyb and I are still debugging, but one of the problems I found is his MTU size. He was using the default MTU which is 576, when 1500 is optimal for Ethernet. MTU is specified in the mTCP CFG file, so if you have not set it then you are using the default of 576. Larger MTU …

Re: A new mTCP is available! (version 2020-01-01)

in Milliways
Ok, well clearly that bug isn't the cause of your pain. (The debug log showed the same excessive number of missed packets.) There were not many changes to the TCP layer and below between 2015 and 2020. The window resizing code was added and was pretty extensively tested, but even then it still has …

Re: A new mTCP is available! (version 2020-01-01)

in Milliways
Grzyb, I started digging through the code and I noticed a bug that might be responsible for what you are seeing. Try this, and if it works, then I'll tell you what I screwed up. (And then fixed ...) http://www.brutman.com/mTCP/ftp_flowcontrolfix.exe (I can't click on the link to start the download, …

Re: A new mTCP is available! (version 2020-01-01)

in Milliways
Grzyb, In 2019 I added code to improve the flow control on noisy/lossy connections. That code shrinks and grows the TCP receive window size depending on how many packets are being lost. Without this code connections would often just freeze and die because the two sides would get so far apart that …

Re: A new mTCP is available! (version 2020-01-01)

in Milliways
Interesting, but I suspect it is related to your packet driver setup. On my 386-40 I get the following: 2015 code: 526.3 KB/sec sending and 543.6 KB/sec receiving 2020 code: 464.5 KB/sec sending and 485.2 KB/sec receiving (All tests are with a 16K TCP buffer and a 16K file buffer) So it is slower, …

Re: A new mTCP is available! (version 2020-01-01)

in Milliways
What is the scope of mTCP? I chose TCP/IP because it is the open protocol of choice for any machine to use. It is not just about simple printer and file sharing. Telnet and FTP can take you anywhere the Internet is, no matter what that machine is. You can choose to use it on your own home network or …

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