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From: ab@distler.maschinenbau.uni-dortmund.de (Andreas Braukmann (NetAdmin))
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: SCSI - throughput
Date: 15 Sep 1995 13:18:52 GMT
Organization: University of Dortmund, LTD II
Lines: 66
Message-ID: <43bufs$ekb@nx2.hrz.uni-dortmund.de>
NNTP-Posting-Host: distler.maschinenbau.uni-dortmund.de
X-Newsreader: TIN [version 1.2 PL2]
Hi everybody,
... just for the records.
A few hours ago I've hooked up a new 4.3 GB disk to my FreeBSD box.
hardware: i486DX2, 66MHz, 32 MB RAM
EISA (sis), AHA2742AT,
sd0: FUJITSU M2694ES-512 812A
sd1: IBM OEM DFHSS4F 4040 (DHFS 34320 4.3 GB)
os: FreeBSD 2.0.5 (950622-SNAP)
for the DFHS:
bonnie -s 512
File './Bonnie.295', size 536870912
[...]
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
1379 98.3 3244 64.0 1448 47.9 1342 98.4 3226 52.3 74.7 9.1
for the M2694:
bonnie -s 96
File './Bonnie.385' size: 100663296
[...]
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
1367 97.5 1855 28.8 998 34.1 1339 98.1 2669 42.6 57.7 6.8
hmm, it seems, that the character i/o is constrained by the cpu.
I've switched from an AHA1742A to the 2742AT a couple of months ago.
Unfortunetly I have no exact 1742 based bonnie results for comparison, but
as far as I remember the 1742A(driver) gave better character i/o throughput,
especially it didn't eat that much cpu-cycles.
Have a look at the iozone-results.
(Same machine, 16MB RAM, disk is the Fuji. 2694)
1742: 1973790 bytes/second for writing
2966137 bytes/second for reading
time: 0.5 u 21.9 s 0:28.72 78,3%
2742: 1760232 bytes/second for writing
2542905 bytes/second for reading
time: 0.6 u 29.7 s 0:32.52 93,3%
Should I switch back to the 1742? As I need the two SCSI-channels, I would
have to find a second 1742, ... and that does'nt seem to be that easy these
days ...
Greetings,
Andreas
P.S. ... sorry, ... English is not my native language ...
--
+------------------------------------------------------+
| Andreas Braukmann University of Dortmund |
+------------------------------------------------------+
| braukman@ls12.informatik.uni-dortmund.de |
| ab@ltd2.maschinenbau.uni-dortmund.de |
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