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From: Burkard Meyendriesch <bm@malepartus.de>
Subject: SCSI; tagged command queuing
To: freebsd-stable@FreeBSD.ORG
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Date: Thu, 25 Jun 1998 14:29:36 +0200
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Hi all,

I'm running FreeBSD (2.2-stable) on an ASUS-Motherboard (K6/233Mhz) with
onboard SCSI controller "Adaptec aic7880 Ultra SCSI host adapter" driven
by "ahc0" device driver. I'm operating a couple of SCSI devices (tapes,
disks, CDs) on the SCSI bus. My experience is that using a tape slows
down the disk I/O significantly. So I decided to use "tagged command
queuing". (Yes, I did read the comments on this in the generig config
file "/usr/src/sys/i386/conf/LINT". ;-) )

I used the following options in my kernel configuration:

    #options        FAILSAFE                # don't Be conservative
    options         AHC_TAGENABLE
    #options        AHC_SCBPAGING_ENABLE
    options         AHC_ALLOW_MEMIO

The kernel compiles smoothly and works well. But the "tagged command
queuing" doesn't seem to work :-(
I'm quite sure that this is MY mistake; but what am I doing wrong?

Can anybody please give me any hint?
Burkard

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