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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!clarkson!smithbm
- From: smithbm@craft.camp.clarkson.edu (Azrak)
- Subject: Re: ESDI performance
- Message-ID: <smithbm.721263957@craft.camp.clarkson.edu>
- Sender: news@news.clarkson.edu
- Nntp-Posting-Host: craft.camp.clarkson.edu
- Organization: Clarkson University
- References: <Bx9HEu.5oL@law7.DaytonOH.NCR.COM>
- Date: Sun, 8 Nov 1992 23:05:57 GMT
- Lines: 35
-
- jra@law7.DaytonOH.NCR.COM (John Ackermann x 2966) writes:
-
- >What kind of performance (throughput) is typical for ESDI drives? I've
- >got an Adaptec track-caching controller (64k cache) and an older CDC
- >182MB drive, running on a 486SX-25 machine.
-
- >The seek time is very good -- something like 16ms according to all my
- >benchmarks -- but the throughput isn't much better than my old MFM
- >controller and drive with 1:1 interleave. The benchmarks say the ESDI
- >system is giving me about 550kb/sec transfer rate -- the MFM system
- >showed about 490kb/sec.
-
- My Father's 386DX 20MHz with Western Digital ESDI controller goes at
- 16ms and 550kb/sec also. You should be getting a little (or maybe a lot)
- better performance than what you are. Maybe 650kb/sec.
-
- I also know people here at Clarkson with 286 8MHz machines and MFM
- controllers can get 450kb/sec, so no matter how you look at it, ESDI
- is going quite slow. If a 286-8 can get 450kb/sec, a 386DX-20 should be
- getting 800kb/sec and your machine should be getting 1000kb/sec.
-
- (Yes, the drive is interleaved at 1:1, which was calculated to be
- the most optimal)
-
- >Do these benchmarks understate the performance of my system, do I have
- >something wrong, or is there really no advantage to ESDI?
-
- Beats me. If you find out, please tell me. :)
-
- >--
- >John R. Ackermann, Jr. Law Department, NCR Corporation, Dayton, Ohio
- >(513) 445-2966 John.Ackermann@daytonoh.ncr.com
- >Packet Radio: ag9v@n8acv tcp/ip: ag9v@ag9v.ampr [44.70.12.34]
-
- - Brian (smithbm@craft.camp.clarkson.edu)
-