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- Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
- Path: sparky!uunet!uvaarpa!darwin.sura.net!paladin.american.edu!auvm!CORNELLC.CIT.CORNELL.EDU!TJF
- Message-ID: <IBMTCP-L%93012710352581@PUCC.PRINCETON.EDU>
- Newsgroups: bit.listserv.ibmtcp-l
- Date: Wed, 27 Jan 1993 10:30:32 EST
- Sender: IBM TCP/IP List <IBMTCP-L@PUCC.BITNET>
- From: Gary Buhrmaster <TJF@CORNELLC.CIT.CORNELL.EDU>
- Subject: Re: IBM TCP/IP inadequacies
- Lines: 35
-
- On Wed, 27 Jan 1993 01:54:00 PST, Leonard D Woren <LDW@USCMVSA.BITNET>
- said:
-
- >On Tue, 26 Jan 1993 13:09:34 CST,
- > Rick Troth <TROTH@RICEVM1.RICE.EDU> re-opened a can of worms:
- >
- >...
- >
- >> Denis, what I think you want to ask for is a higher-level tool
- >> for IBM Mainframe TCP/IP to be built on. Under the covers, this would
- >> use IUCV on VM, but use (sorry I don't know what you've got) whatever
- >> is native to MVS inter-process comm when running on MVS.
- >
- >Well, there really isn't one, so every product has to invent their own.
- >This is one of the most glaring deficiencies in MVS.
- >
-
- Well, actually, IBM seems to be promoting APPC for communication, which
- would allow you to run the server elsewhere in the gaggle of (smaller,
- cost effective) MVS/ESA machines in your sysplex. However, when you
- can be assured the server and client are within the same physical
- machine, the architected solution would seem to be AR mode where the
- server could directly access the private area(s) of the client, or a
- special TCP/IP dataspace used to exchange data between the client and
- the server using normal instructions without all the extra DAS
- overhead of moving data between the secondary and primary address
- spaces. The performance could be outstanding. As I recall that was
- one of the big performance gains in the original UNIX TCP/IP
- implementations (passing pointers to the buffers rather than moving the
- buffer data). Unfortunately, these features only work at current
- MVS/ESA levels, and IBM seems committed to continuing TCP/IP support
- for MVS/XA, which means they are limited to using facilties that it
- supports.
-
- Gary Buhrmaster
-