Thanks, Lynn. The date on the post suggests, for VM, October 1987, HPO 4.2.
Cheers,,,Steve Steven F. Conway, CISSP LA Systems z/OS Systems Support Phone: 703.295.1926 [email protected] From: Anne & Lynn Wheeler <[email protected]> To: [email protected] Date: 04/14/2011 11:44 AM Subject: Re: TCP/IP Available on MVS When? Sent by: IBM Mainframe Discussion List <[email protected]> [email protected] (Steve Conway) writes: > OK, let's invoke Jaffe's Law (Any ibm-main discussion will eventually > become a history lesson) immediately. > > In this case, I need a history lesson, preferably with citable references. > > When (year and OS release, if available) did TCP/IP become available for > VM? For MVS? > > No forum is more perfectly suited for my question. :-) the company product was done on VM and implemented in vs/pascal (5798-FAL). it had a number of thruput issues ... but I did the RFC1044 enhancements and in some testing at Cray research ... between a 4341 and cray ... got channel media sustained thruput using only modest amount of 4341 cpu (about 500 times improvement in instructions executed per byte moved). misc. past posts mentioning rfc 1044 http://www.garlic.com/~lynn/subnetwork.html#1044 vmshare reference to 5798-fal: http://vm.marist.edu/~vmshare/browse?fn=TCPIP&ft=PROB the base implementation was later made available on MVS by moving over the VM code and writting a simulation for some of the VM functions. later there was a contract to implement tcp/ip support in VTAM. the folklore is that when the implementation was first demo'ed ... the company said that it was only paying for a "correct" implementation ... and everybody knows that a "correct" tcp/ip implementation is significantly slower than LU6.2 (not significantly faster). The contract was handled by "local" ibm office in Palo Alto Sq office bldg. now predating products ... there was various univ. implementations ... reference to tcp/ip at UCLA MVS in late 70s: http://en.wikipedia.org/wiki/Bob_Braden predates the great switchover from host/imp protocol to tcp/ip protocol on 1jan83. -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
