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- Newsgroups: comp.os.linux
- Path: sparky!uunet!gatech!destroyer!ncar!csn!teal!dmw
- From: dmw@teal.csn.org (Dave Warner)
- Subject: Re:Question about ISA/IDE disk throughput (pc newbie)
- Message-ID: <dmw.724992752@teal>
- Sender: news@csn.org (news)
- Nntp-Posting-Host: teal.csn.org
- Organization: Colorado SuperNet, Inc.
- Date: Tue, 22 Dec 1992 02:52:32 GMT
- Lines: 57
-
-
- turbo@cse.uta.edu (Chris Turbeville) writes:
-
- >In article <MUTS.92Dec21193512@PMCS.estec.esa.nl> muts@estec.esa.nl (Peter Mutsaers) writes:
- >>Sorry if you see this message twice. I posted before but the article
- >>didn't seem to show up.
- >I didn't see it twice.
- >>
- >>In a magazine I read for a couple of 386sx PC's that disk access (IDE)
- >>is only at 200 kbyte/s. This seems terribly slow to me, especially
- >>for an OS like unix. Is this really true? Do 486dx's have much better
- >>IO speeds? How can UNIX live with such a low bandwidth. Are local
- >>busses much faster (how much)?
- >200kB/s sounds about right for IDE (save the newer caching controllers)
- >and it is terribly slow. 486dx's make no improvement on disk transfer
- >speed. It is your 16bit 8Mhz ISA bus which is limiting it. I don't
- >think full blown vmunix would live well in such an environment. Local
- >busses are faster and so is EISA but here is my quandry. I want top
-
- [stuff deleted]
-
- My experience differs.
- Here's an iozone benchmark on a Gateway dx2-66v, 8MB ram with
- local bus and a WD IDE drive (Pirhana, I think) with linux.0.99 -- output
- from 'free' included to show cache size:
-
- IOZONE: Performance Test of Sequential File I/O -- V1.16 (10/28/92)
- By Bill Norcott
-
- Operating System: POSIX 1003.1-1988
-
- Send comments to: norcott_bill@tandem.com
-
- IOZONE writes a 16 Megabyte sequential file consisting of
- 32768 records which are each 512 bytes in length.
- It then reads the file. It prints the bytes-per-second
- rate at which the computer can read and write files.
-
-
- Writing the 16 Megabyte file, 'iozone.tmp'...22.610000 seconds
- Reading the file...17.770000 seconds
-
- IOZONE performance measurements:
- 742026 bytes/second for writing the file
- 944131 bytes/second for reading the file
-
- /home>free
- total used cache free shared
- memory: 7316 5040 2232 44 3884
- swap0: 16380 8 16372 0
-
- --dave
- --
-
- | Dave Warner | e-mail: dmw@csn.org |
- | 151 Sky Trail Road | USWest: 443-9589 |
- | Boulder, CO 80302 | FAX: 443-6791 |
-