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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
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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
> 
> 
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