Date: Mon, 1 Apr 1996 21:03:28 +0930 (CST) From: Michael Smith <msmith@atrad.adelaide.edu.au> To: dutchman@spase.nl (Kees Jan Koster) Cc: freebsd-hackers@FreeBSD.org Subject: Re: HDD cpu usage (IDE vs. SCSI). Message-ID: <199604011133.VAA06543@genesis.atrad.adelaide.edu.au> In-Reply-To: <199604010903.LAA07931@deimos.spase.nl> from "Kees Jan Koster" at Apr 1, 96 11:03:46 am
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Kees Jan Koster stands accused of saying: > > I was told that cpu usage of SCSI disks was lower than that of IDE disks. ... in general, it is. > LikeEver (amd486DX4-100, ncr pci scsi controller) > Seagate -------Sequential Output-------- ---Sequential Input-- --Random > -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks > Directory K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU > /usr 1299 81.1 1263 15.5 653 18.2 1778 94.9 1982 41.8 47.7 5.7 > /tmp (mfs) 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 K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU > /var 750 41.9 740 8.5 405 9.7 764 34.7 770 8.8 32.0 3.9 > /tmp (mfs) 948 48.5 479 6.4 481 9.3 772 39.0 1228 19.3 39.0 4.7 > /msdos 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 K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU /sec %CPU > /usr 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? Try comparing apples with apples. Your benchmarks are pretty meaningless, but one obvious observation : P90's are faster then DX4's. > Kees Jan Koster e-mail: dutchman@spase.nl -- ]] Mike Smith, Software Engineer msmith@atrad.adelaide.edu.au [[ ]] Genesis Software genesis@atrad.adelaide.edu.au [[ ]] High-speed data acquisition and (GSM mobile) 0411-222-496 [[ ]] realtime instrument control (ph/fax) +61-8-267-3039 [[ ]] Collector of old Unix hardware. "Where are your PEZ?" The Tick [[
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