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- Newsgroups: comp.arch
- Path: sparky!uunet!rde!ksmith!keith
- From: keith@ksmith.uucp (Keith Smith)
- Subject: Re: BUSES
- Organization: Keith's Computer, Hope Mills, NC
- Date: Mon, 27 Jul 92 19:13:47 GMT
- Message-ID: <1992Jul27.191347.4485@ksmith.uucp>
- References: <1992Jul23.092211.18462@nuscc.nus.sg> <1992Jul23.191927.1181@pcnntp.apple.com>
- Lines: 38
-
- In article <1992Jul23.191927.1181@pcnntp.apple.com> pauls@apple.com (Paul Sweazey) writes:
- >In article <1992Jul23.092211.18462@nuscc.nus.sg> eletanjm@nuscc.nus.sg
- >(TAN JIN MENG) writes:
- >>[Bus Speed & Efficiency ??? ...]
- >
- >Over the last decade or so processors, RAM, and disk storage have all
- >increased in speed or capacity by two or three orders of magnitude. Where
- >have buses gone during the same period? Not very far, not in real-world,
- >affordable systems. This imbalance has turned modularity into a myth. If
- >add-in hardware were both blindingly fast and incredibly cheap then
- >modular computers might be a much more interesting market.
-
- Is it not also true however, that the current disk devices can't even
- swamp an ISA bus? The average desktop doesn't have multiple striped
- disks and whatnot.
-
- Even the new crop cannot swamp an EISA bus. Video may soon go another
- route, we will see. Memory is already localized, as part of the CPU on
- most products, with a SIMM pinout becomming a local memory bus of sorts.
-
- Someone please correct me if I'm wrong, but I think the inherent problem
- with a 'bus' of any description is the delay while the electrons take a
- torturous route across the copper foiling, and thru the connectors and
- buffers from the CPU to whatever card. As clock speeds of CPU chips
- go up, it just takes too long for the information to run accross the
- conductors. Now how are we going to design a bus that makes the
- electrons move quicker across the wires?
-
- IMHO the only way to solve this is to have seperate input and output
- "busses" that allow for multiple electrons to be traveling across the
- "wires" at the same time. Seperate because you can be sending fetch
- requests off of one side while yanking them in on the other.
-
- ramble, ramble, ramble on...
- --
- Keith Smith uunet!ksmith!keith 5719 Archer Rd.
- Digital Designs BBS 1-919-423-4216 Hope Mills, NC 28348-2201
- Somewhere in the Styx of North Carolina ...
-