Date: Wed, 20 Jan 1999 21:10:37 +0900 (KST) From: Ham su-wook <casanoba@ailab.sogang.ac.kr> To: Greg Holloway <greg@internex.net.au> Cc: FreeBSD Question <freebsd-questions@FreeBSD.ORG> Subject: Re: 3.0R, aic7895, slow transfer rates Message-ID: <Pine.BSF.4.05.9901202102330.317-100000@ailab.sogang.ac.kr> In-Reply-To: <3.0.6.32.19990119184125.012a7e20@preeda.internex.net.au>
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It may not answer your question, but I am using similar system with you. I am also using AIC7895 and FreeBSD 3.0R. But I am using HDD in success. When machine is at boot up, it shows that da0 at ahc0 bus 0 target 0 lun 0 da0: <QUANTUM FIREBALL ST4.3S 0F0C> Fixed Direct Access SCSI2 device da0: 20.0MB/s transfers (20.0MHz, offset 15), Tagged Queueing Enabled da0: 4136MB (8471232 512 byte sectors: 64H 32S/T 4136C) I'm using Tyan S1696DLUA mother board and Ultra-SCSI drive(50pin) as you read above message But I'm not expert, so can't know why your machine get poor ability. Take it easy. from Ham su-wook, Artificial Intelligence, Sogang Univ. mailto:casanoba@ailab.sogang.ac.kr http://ailab.sogang.ac.kr/~casanoba On Tue, 19 Jan 1999, Greg Holloway wrote: > Hi, > > Recently I installed 3.0R on a new PC with aic7895 SCSI controller and > one Quantum Fireball Ultra-SCSI drive (50 pin). I am using the CAM driver. > > Performance is very poor (ie. 40-50% slower) compared to 2.2.8R with an > aic7880 controller and the same drive. Here is the output from the CAM > driver > at bootup: > > da0 at ahc0 bus 0 target 0 lun 0 > da0: <QUANTUM FIREBALL ST6.4S 0F0C> Fixed Direct Access SCSI2 device > da0: 5.0MB/s transfers (5.0MHz, offset 15), Tagged Queueing Enabled > da0: 6180MB (12657717 512 byte sectors: 255H 63S/T 787C) > > I don't understand why it decided to use 5.0MB/s when the drive is > capable of 10MB/s. I looked at all the scsi_mode pages using camcontrol > but I can't find a way to adjust the speed. > > Any ideas whether this a problem with my drive, the aic7895, or the CAM > driver? > > > Thanks! > > > Regards > > Greg Holloway > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-questions" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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