Date: Tue, 19 Jan 1999 18:41:25 +1100 From: Greg Holloway <greg@internex.net.au> To: freebsd-questions@FreeBSD.ORG Subject: 3.0R, aic7895, slow transfer rates Message-ID: <3.0.6.32.19990119184125.012a7e20@preeda.internex.net.au>
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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
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