Date: Fri, 29 Nov 1996 22:28:12 -0600 From: Raul Zighelboim <mango@staff.communique.net> To: "'hackers@freefall.freebsd.org'" <hackers@freefall.freebsd.org> Cc: "'hardware@freefall.freebsd.org'" <hardware@freefall.freebsd.org> Subject: Adaptec UW controller and Seagate Elite performance ? Message-ID: <c=US%a=_%p=Communique._Inc.%l=KAORI-961130042812Z-340@kaori.communique.net>
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Hello there!
My system is not performing as expected.
Trying to find out were the bottleneck is, I run Bonnie and iozone
benchmarks
on the system while no i/o processes were running.
I got the following results:
# bonnie -s 40 (akira, http running)
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
40 3271 34.8 3085 13.0 1559 8.3 10330 97.1 44763 95.7 991.0 20.4
and
IOZONE performance measurements:
2039008 bytes/second for writing the file
34861747 bytes/second for reading the file
It bothered me that:
1- reading is 20 times faster than writing
2- 2Mbytes/s for writing seems slow, even if this was a scsi-2 and not
an
scsi fast and wide drive.
Are this results the expected values for a UW scsi drive/controller ?,
and if
not, can someone point me in the correct direction to get this resolved
?
Thanks.
------------------------
------------------------
Raul Zighelboim
Communique Inc.
mailto:mango@communique.net
http://www.communique.net
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