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- From: oreillym@tartarus.uwa.edu.au (Michael O'Reilly)
- Newsgroups: comp.unix.bsd,comp.os.linux
- Subject: Re: IDE faster than SCSI-2
- Date: 7 Nov 1992 09:50:50 +0800
- Organization: Home
- Lines: 33
- Message-ID: <1df7dqINN37o@tartarus.uwa.edu.au>
- References: <1992Nov5.080716.10386@ntuix.ntu.ac.sg>
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-
- Othman Ahmad (eoahmad@ntuix.ntu.ac.sg) wrote:
- : I posted an iozone benchmark using my 386/25Mhz machine which shows that
- : it is slightly slower than a SCSI-2 hard-disk. Now with a 486/33, IDE is
- : definitely faster than a EISA SCSI-2 486/50MHZ hard-disk.
- : Iozone uses normal unix system calls for writing to disks, after all,
- : that is how we write C programs.
- : I may try to run a more sophisticated file system tester called
- : bi? later on.
- :
- :
- : JUlian's machine
- : is a 50MHz EISA 486 with a 1.3GB drive attached via a Bustek 742a SCSI2
- : adapter. It has 16MB of ram. Part of the disk (about 200MB is taken up
- : by mach2.6 and is unavailable to 386bsd.
- :
- : I checked the load on this machine, it is very light. There is only another
- : user apart from I.
- :
- : iozone 1
- :
- : Writing the 1 Megabyte file, 'iozone.tmp'...1.766667 seconds
- ^
- ^ This is useless. It tells no-one anything. A one meg
- file should fit entirely in the cache. So unless BSD is braindead, and
- doesn't cache (which I doubt), then you have just measured the cache
- speed. On my 486/33, 8 meg ram, a 1 meg files get 10 megs per second.
- The disk is never accessed, unless a sync kicks in 1/2 way though.
-
- I don't know exactly what you measured, but it sure ain't disk speed.
-
- : Othman bin Ahmad, School of EEE,
- :
- Michael
-