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- Path: sparky!uunet!stanford.edu!agate!agate.berkeley.edu!cgd
- From: cgd@eden.CS.Berkeley.EDU (Chris G. Demetriou)
- Newsgroups: comp.unix.bsd
- Subject: Re: bonnie i/o test results
- Date: 6 Nov 92 23:28:22
- Organization: Kernel Hackers 'r' Us
- Lines: 69
- Message-ID: <CGD.92Nov6232822@eden.CS.Berkeley.EDU>
- References: <1992Nov6.144749.26760@ntuix.ntu.ac.sg>
- NNTP-Posting-Host: eden.cs.berkeley.edu
- In-reply-to: eoahmad@ntuix.ntu.ac.sg's message of Fri, 6 Nov 1992 14:47:49 GMT
-
-
- LOOK, I'M SURE I'M NOT THE ONLY ONE WHO'S SICK OF SEEING BENCHMARKS WITH
- ABSOLUTELY NO TECHNICAL MERIT.
-
- (and yes, i had to scream.)
-
- In article <1992Nov6.144749.26760@ntuix.ntu.ac.sg> eoahmad@ntuix.ntu.ac.sg (Othman Ahmad) writes:
-
- Julian 486/50 16M RAM, bustek SCSI-2 disk,
-
- -------Sequential Output-------- ---Sequential Input-- --Random--
- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
- 32 405 48.2 389 8.4 152 5.6 505 53.1 461 10.3 20.0 5.0
-
- My machine 386/25 8M RAM , IDE Maxtor 200M disk,
-
- -------Sequential Output-------- ---Sequential Input-- --Random--
- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
- 16 121 99.2 350 15.6 190 17.7 108 99.8 454 16.4 25.9 8.9
-
- Just look at the Random seek figure, the smaller IDE is faster despite having
- more CPU load.
-
-
-
- in terms of reading and writing, as you can see from your above stats,
- Julian's SCSI disk generally kicks your IDE disk's butt.
-
- The one stat you cite is average random seek time, and that's the probably
- the *MOST* meaningless of all of the above stats.
-
- why? because i'll bet money that your maxtor 200 IDE is a 3.5" disk,
- and i know that Julian's disk is 5.25".
-
- I've got a 3.5" inch w/an average seek time of 12ms (which should get
- me 83 seeks per second)... what does that prove, in terms of SCSI vs.
- IDE?
-
- *NOTHING*
-
- why? because i'm pretty sure that they make the same disk w/ an IDE
- controller.
-
-
-
- PLEASE, before posting any more benchmarks:
- (1) learn about disk architecture.
- If you knew anything about it, you'd know
- that seek time is *disk* dependent, not
- controller dependent.
-
- (2) run the benchmarks on "equivalent" hardware.
- for instance, Maxtor 200M IDE vs. Maxtor 200M SCSI
- (i'd to the SCSI benchmark for you, but the only
- Maxtor 200M SCSI I have kicked off a few months ago...)
-
-
- <sigh>
-
- and now back to some driver hacking...
-
- Chris
- --
- Chris G. Demetriou cgd@cs.berkeley.edu
-
- "Sometimes it is better to have twenty million instructions by
- Friday than twenty million instructions per second." -- Wes Clark
-