Date: Tue, 25 Jul 2000 15:33:11 -0400 (EDT) From: "Chris D. Faulhaber" <jedgar@fxp.org> To: The Hermit Hacker <scrappy@hub.org> Cc: freebsd-scsi@freebsd.org Subject: Re: 4.1RC read/write speeds ... Message-ID: <Pine.BSF.4.21.0007251531380.23824-100000@pawn.primelocation.net> In-Reply-To: <Pine.BSF.4.21.0007251600460.3502-100000@thelab.hub.org>
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On Tue, 25 Jul 2000, The Hermit Hacker wrote: > > Does this look right for a Dual-PIII, no load other then the operating > system, idle disk *only* being used for the tests ... just seems low to > me: > > > Writing the 232 Megabyte file, 'iozone.tmp'...14.273438 seconds > Reading the file...3.328125 seconds > > IOZONE performance measurements: > 17043521 bytes/second for writing the file > 73095100 bytes/second for reading the file > > ============== > > full configuration fo that machine can be seen at > http://atelier.acadiau.ca, but the basics are: > > ========= > ahc0: <Adaptec 2940 Ultra SCSI adapter> port 0xa800-0xa8ff mem 0xe0000000-0xe0000fff irq 10 at device 11.0 on pci0 > ahc0: aic7880 Wide Channel A, SCSI Id=7, 16/255 SCBs > =========== > > da1 at ahc0 bus 0 target 1 lun 0 > da1: <WDIGTL WDE9180 ULTRA2 1.30> Fixed Direct Access SCSI-2 device > da1: 40.000MB/s transfers (20.000MHz, offset 8, 16bit) > da1: 8727MB (17873040 512 byte sectors: 255H 63S/T 1112C) > > You may want to try without the quirk entry. From /sys/cam/cam_xpt.c: { /* * Slow when tagged queueing is enabled. (1.5MB/sec versus * 8MB/sec.) * Submitted by: Andrew Gallatin <gallatin@cs.duke.edu> * Best performance with these drives is achieved with * tagged queueing turned off, and write caching turned on. */ { T_DIRECT, SIP_MEDIA_FIXED, west_digital, "WDE*", "*" }, /*quirks*/0, /*mintags*/0, /*maxtags*/0 }, ----- Chris D. Faulhaber - jedgar@fxp.org - jedgar@FreeBSD.org -------------------------------------------------------- FreeBSD: The Power To Serve - http://www.FreeBSD.org To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message
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