Anne & Lynn Wheeler <[email protected]> writes: > The native FCS has complete I/O requests being sent down the outbound > path effectively as data ... and then actual data occuring > asynchronously ... with minimal end-to-end handshaking latency. This > dates back at least to the work I did on HYPERChannel in 1980 for > mainframe channel extender (in the case of moving 300 people IMS group > to offsite, the local 3270 channel attached terminals worked better over > HYPERChannel 1.5mbit/sec link ... the end users saw no difference and > the real IBM mainframe channel efficiency improved 10-15%). some > past posts > http://www.garlic.com/~lynn/subnetwork.html#hsdt
Two major people behind cdc6600 (mentioned in the article) are Cray and Thornton; Cray leaves and forms Cray Research (supercomputer) and Thornton leaves and forms Network Systems (that does HYPERChannel). In 1980, Network Systems wants to release my mainframe channel extender HYPERChannel software support. The people in POK playing with what gets released as ESCON a decade later, get it veto'ed because they are afraid that if its in the market, it might interfere with them being able to get ESCON released. IBM eventually does a mainframe tcp/ip product ... however, because the communication group is fighting off client/server and distributed computing (in defense of their dumb terminal paradigm and their dumb terminal emulation install base) ... some past posts http://www.garlic.com/~lynn/subnetwork.html#terminal they claim that the LAN/channel interface for tcp/ip is under their control ... it gets enormously more expensive and significantly slower ... it has about 44kbytes/sec using nearly full 3090 cpu. I then do the rfc1044 enhancements for tcp/ip and in some tuning tests between 4341 and cray at cray research, it gets sustained channel throughput using only modest amount of 4341 processor (about factor of 500 times improvement in bytes moved per instruction executed). misc. past posts mentioning rfc1044 http://www.garlic.com/~lynn/subnetwork.html#1044 -- 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: INFO IBM-MAIN
