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- Path: sparky!uunet!gatech!rutgers!ub!acsu.buffalo.edu!ubvmsd.cc.buffalo.edu!v206gb6c
- From: v206gb6c@ubvmsd.cc.buffalo.edu (IS AN ILLEGAL PERSONAL NAME)
- Newsgroups: comp.sys.ibm.pc.hardware
- Subject: Re: ESDI performance
- Message-ID: <BxFMB9.GsM@acsu.buffalo.edu>
- Date: 9 Nov 92 04:40:00 GMT
- References: <Bx9HEu.5oL@law7.DaytonOH.NCR.COM> <smithbm.721263957@craft.camp.clarkson.edu>
- Sender: nntp@acsu.buffalo.edu
- Organization: University at Buffalo
- Lines: 45
- News-Software: VAX/VMS VNEWS 1.41
- Nntp-Posting-Host: ubvmsd.cc.buffalo.edu
-
- In article <smithbm.721263957@craft.camp.clarkson.edu>, smithbm@craft.camp.clarkson.edu (Azrak) writes...
- >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.
- >
-
- Hmm... I have a Western Digital 1007V-SE2 hooked to two EDSI drives,
- 1 miniscribe @ 160 megs and 1 ??? at 320 megs. I get a throughput of
- approx. 950kb/sec on each drive (himem and emm386 alter the results
- slightly, why?). I'm running it on a AMD386-40. Could you have the
- card in an 8-bit slot? Is it 8-bit? Both of these will slow it down.
- Possibly, if you have an 8-bit video card, the part of the bus that the
- ESDI controller is operating on is also stuck at 8-bit (only MDA/Herc
- compatible cards could cause this). Do you have any specs on the drive or
- controller? What kind of transfer rates do they suggest?
-
- >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.
- >
-
- Not quite, but you should get some sort of improvment as the processor
- speed increases (up to a max a little below 1000kb/sec).
-
- >>Do these benchmarks understate the performance of my system, do I have
- >>something wrong, or is there really no advantage to ESDI?
- >
-
- Somethings wrong or you have a no advantage ESDI set up. Are you using
- the Coretest benchmark? or something else? I'd recommend Coretest (avaliable
- via FTP somewhere).
-
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