Date: Mon, 1 Apr 1996 11:03:46 +0200 (MET DST) From: Kees Jan Koster <dutchman@spase.nl> To: freebsd-hackers@FreeBSD.ORG (FreeBSD hackers Mailing list) Subject: HDD cpu usage (IDE vs. SCSI). Message-ID: <199604010903.LAA07931@deimos.spase.nl>
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Hoi Hackers,
I was told that cpu usage of SCSI disks was lower than that of IDE disks.
However:
LikeEver (amd486DX4-100, ncr pci scsi controller)
Seagate -------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Directory MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
/usr 20 1299 81.1 1263 15.5 653 18.2 1778 94.9 1982 41.8 47.7 5.7
/tmp (mfs) 20 689 33.7 285 3.4 274 4.5 397 17.5 503 5.7 27.0 3.3
Maxtor -------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Directory MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
/var 20 750 41.9 740 8.5 405 9.7 764 34.7 770 8.8 32.0 3.9
/tmp (mfs) 20 948 48.5 479 6.4 481 9.3 772 39.0 1228 19.3 39.0 4.7
/msdos 20 28 4.5 74 3.3 43 1.9 111 7.7 111 3.6 9.6 10.9
phobos (pentium 90, on-board IDE controller)
Quantum -------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
Directory MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU
/usr 40 1215 41.7 1818 18.8 811 11.5 1376 41.0 1990 16.0 39.9 3.9
How come the seagate uses twice as much cpu as the quantum?
Groetjes,
Kees Jan
======================================================================v==
Kees Jan Koster e-mail: dutchman@spase.nl
Van Somerenstraat 50 tel: NL-24-3234708
6521 BS Nijmegen
the Netherlands
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Who is this general Failure and why is he reading my disk? (anonymous)
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