Date: Thu, 25 Jun 1998 14:29:36 +0200 From: Burkard Meyendriesch <bm@malepartus.de> To: freebsd-stable@FreeBSD.ORG Subject: SCSI; tagged command queuing Message-ID: <199806251229.OAA22711@Reineke.Malepartus.de>
next in thread | raw e-mail | index | archive | help
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
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-stable" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?199806251229.OAA22711>