Date: Sun, 10 Aug 1997 02:58:47 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: michaelv@MindBender.serv.net (Michael L. VanLoon -- HeadCandy.com) Cc: plm@xs4all.nl, freebsd-current@FreeBSD.ORG Subject: Re: IDE vs SCSI was: flags 80ff works (like anybody doubted it) Message-ID: <199708100758.CAA01850@dyson.iquest.net> In-Reply-To: <199708100714.AAA04251@MindBender.serv.net> from "Michael L. VanLoon -- HeadCandy.com" at "Aug 10, 97 00:14:29 am"
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> l count=1600 bs=64k& > >i.e. start two of them at the same time. > >I get as result: > >104857600 bytes transferred in 41.430049 secs (2530955 bytes/sec) > >104857600 bytes transferred in 41.437855 secs (2530478 bytes/sec) > > What would be much more interesting to me is if you would do this on a > four-drive ccd stripe-set, both with Ultra-Wide SCSI and "UltraIDE". > It would be interesting to have a process running non-stop, measuring > the amount of left-over CPU, at the same time. > That *would* be interesting. Here are the results for running 2 and 3 concurrent tests -- my GUESS it is likely that the drive is fairly slow because of the small (read ahead) cache on it -- this is on the same drive: 1600+0 records in 1600+0 records out 104857600 bytes transferred in 68.005133 secs (1541907 bytes/sec) 1600+0 records in 1600+0 records out 104857600 bytes transferred in 68.032161 secs (1541295 bytes/sec) 1600+0 records in 1600+0 records out 104857600 bytes transferred in 90.446126 secs (1159338 bytes/sec) 1600+0 records in 1600+0 records out 104857600 bytes transferred in 96.159300 secs (1090457 bytes/sec) 1600+0 records in 1600+0 records out 104857600 bytes transferred in 96.263071 secs (1089282 bytes/sec) John
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