Date: Wed, 10 Apr 1996 08:08:53 -0500 (EST) From: "John S. Dyson" <toor@dyson.iquest.net> To: se@ZPR.Uni-Koeln.DE (Stefan Esser) Cc: bde@zeta.org.au, dutchman@spase.nl, freebsd-hackers@freebsd.org Subject: Re: HDD cpu usage (IDE vs. SCSI). Message-ID: <199604101308.IAA00947@dyson.iquest.net> In-Reply-To: <199604091900.AA05584@Sisyphos> from "Stefan Esser" at Apr 9, 96 09:00:11 pm
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> > What I'd really like to see is "disklatency" > output obtained on a fast EIDE system. > Here are some latency results from my machine (2 runs): P5-166, 40MBytes of memory. I would not judge the performance of SCSI in general too harshly, the Hawk is not an extremely high performance drive. I'll follow up with some results from other systems that I can test on later today. NCR-SCSI driver ASUS SC200 W/ST12400 2.1GB Hawk Command overhead is 1370 usec (time_4096 = 2093, time_8192 = 2815) transfer speed is 5.6707e+06 bytes/sec Command overhead is 839 usec (time_4096 = 2093, time_8192 = 3347) transfer speed is 3.26577e+06 bytes/sec Standard IDE W/WDC540H Command overhead is 436 usec (time_4096 = 2001, time_8192 = 3565) transfer speed is 2.61859e+06 bytes/sec Command overhead is 436 usec (time_4096 = 2002, time_8192 = 3568) transfer speed is 2.61586e+06 bytes/sec EIDE W/WDC540H Command overhead is 375 usec (time_4096 = 814, time_8192 = 1254) transfer speed is 9.31994e+06 bytes/sec Command overhead is 368 usec (time_4096 = 800, time_8192 = 1231) transfer speed is 9.49095e+06 bytes/sec EIDE W/WDC 1.6GB Command overhead is 217 usec (time_4096 = 513, time_8192 = 809) transfer speed is 1.38444e+07 bytes/sec Command overhead is 196 usec (time_4096 = 502, time_8192 = 808) transfer speed is 1.33987e+07 bytes/sec SCSI 2.2X CDROM Command overhead is 5655 usec (time_4096 = 9033, time_8192 = 12410) transfer speed is 1.21281e+06 bytes/sec Command overhead is 5670 usec (time_4096 = 9046, time_8192 = 12422) transfer speed is 1.21324e+06 bytes/sec John
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