Ticket #44296

Slow Kermit File Transfer over Telnet

Open Date: 2022-04-08 06:42 Last Update: 2022-04-08 06:42

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Details

While doing transfer of files with Tera Term (Win10 or Win7) Kermit->Send over Telnet into an Unix machine running in SIMH, the max transfer speed is something like 300-1000 Bytes/second. The same setup with K-95g Kermit (also in Win) allows 7500-13000 Bytes/second transfer speed over Telnet. It seems it is a limitation of Tera Term (ie. latest 4.106) caused by either Nagel algorithm, or by not supporting a "stream" option in Kermit, or both, or something else. The Kermit used in the 2.11BSD Unix was C-Kermit version 5A(188) running on a PDP-11/70 in the SIMH simulator (4.0.0 latest).

Kermit 95 (K-95g in Windows) from: https://www.kermitproject.org/k95sourcecode.html Project 1 - files from latest_build.zip (binaries for Windows from 2013)

Kermit in 2.11BSD used: C-Kermit 5A(188), 23 Nov 92, PDP-11 2.10 BSD Type ? or HELP for help C-Kermit>

Ticket History (1/1 Histories)

2022-04-08 06:42 Updated by: pito1
  • New Ticket "Slow Kermit File Transfer over Telnet" created

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