The following message is a courtesy copy of an article that has been posted to bit.listserv.ibm-main as well.
[EMAIL PROTECTED] (Alan Altmark) writes: > I tell you 3 times: Yes. And XEDIT is way better than ISPF, too. And > VM had TCP/IP first. And Rexx. Nyah. }:-) some old mainframe tcp/ip folklore ... the original implementation was done in vs/pascal ... but had some issues with its interface to external boxes. somewhat as a result, it would get about 40kbyte/sec aggregate thruput and could use a whole 3090 processor doing it. i did the rfc 1044 implementation and in some testing at cray research between a 4341 clone and a cray machine ... was getting 1mbyte/sec thruput using only a modest amount of the 4341 processor (i.e. about 25 times the aggregate thruput for about 1/20 the pathlength ... about 400-500 times difference in bytes/transferred per instruction executed). misc. past posts mentioning 1044 support http://www.garlic.com/~lynn/subnetwork.html#1044 the was "ported" to MVS and made available as a product by doing a vm kernel "diagnose" emulation for MVS (i.e. diagnose instruction use in vm is somewhat analogous to svc instruction in mvs). some really old folklore ... was that later there was a outside subcontract to implement tcp/ip support in vtam. the initial implementation came back with tcp support significantly faster than lu6.2 support. they were told that everybody knows that lu6.2 is much more efficient than tcp ... and therefor the only way that tcp implementation could be significantly faster than lu6.2 was if it was implemented incorrectly ... and the contract wouldn't be fullfilled unless there was a "correct" tcp implementation. past post reference http://www.garlic.com/~lynn/2003c.html#77 COMTEN- IBM networking boxes http://www.garlic.com/~lynn/2006f.html#13 Barbaras (mini-)rant http://www.garlic.com/~lynn/2006l.html#53 Mainframe Linux Mythbusting (Was: Using Java in batch on z/OS?) ---------------------------------------------------------------------- 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
