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- Newsgroups: comp.unix.sysv386
- Path: sparky!uunet!utcsri!torn!cunews!revcan!quantum!danh
- From: danh@quantum.on.ca (Dan Hildebrand)
- Subject: Re: Loosing incoming serial characters [summary]
- Message-ID: <0mxns7+@quantum.on.ca>
- Date: Sun, 13 Sep 92 13:29:22 GMT
- Organization: Quantum Software Systems
- References: <0UV6BDS@geminix.in-berlin.de> <BuEwB8.362@gator.rn.com> <1992Sep12.150643.14282@tware.com>
- Lines: 36
-
- In article <1992Sep12.150643.14282@tware.com> bash@tware.com (Paul Bash) writes:
- >In article <BuEwB8.362@gator.rn.com> larry@gator.rn.com (Larry Snyder) writes:
- >>
- >>I would hate to tie up 25% of my CPU just doing serial IO. I have a
- >>bunch of modems all locked at 38400 and 56700, and my CPU loading is
- >>less than 1%. I would never want to waste 25% of the CPU on serial IO
- >
- >Yeah, but most of us can't afford, or can't justify, spending as much on
- >our serial I/O as you obviously do. I'm sure your Digiboard CX (is that
- >right?) setup cost you more than my 486-33 motherboard with 16MB of memory
- >cost me combined (~$1200). I think I can afford to waste a few cycles on
- >my serial I/O.
-
- An interesting question comes up: Which of the following 2 solutions would
- be most effective at enhancing system performance for a serial communications
- intensive application ?
-
- 1) Replace a 486/33 processor with a 486DX2 ( 66 MHz ) processor and add a
- non-intelligent 8 port serial card ( 8 port, 16550-based boards are quite
- inexpensive if you shop around ).
-
- 2) Add a Digiboard, ConnectTech, Comtrol, etc card to your 486/33 system.
-
- Assuming that a 486/66 and the operating system of choice is capable of
- handling the throughput, the boost in processing power would also enhance
- everything else. Solution 2 would have the benefit that available CPU would
- not decrease as much during heavy serial I/O.
-
- This sounds something like the question of either adding a caching disk
- controller ñ your system, or using ñe money for more system RAM or a
- faster hard disk.
- --
- Dan Hildebrand email: danh@qnx.com
- Quantum Software Systems, Ltd. QUICS: danh (613) 591-0934 (data)
- (613) 591-0931 x204 (voice) mail: 175 Terrence Matthews
- (613) 591-3579 (fax) Kanata, Ontario, Canada K2M 1W8
-