Date: Wed, 17 Mar 1999 15:30:40 +0100 (MET) From: Karl-Heinz Herrmann <k.-h.herrmann@fz-juelich.de> To: Albert Max Lai <amlai@columbia.edu> Cc: aic7xxx@FreeBSD.ORG Subject: Re: aic7895, IBM 9ZX, Quantum Viking, slow transfer rates Message-ID: <XFMail.990317153040.k.-h.herrmann@fz-juelich.de> In-Reply-To: <Pine.GSO.3.95qL.990317062541.20196A-100000@merhaba.cc.columbia.edu>
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On 17-Mar-99 Albert Max Lai wrote:
> Tag Queue Enable Flags: 0x0000
> Ordered Queue Tag Flags: 0x0000
> Default Tag Queue Depth: 8
> Tagged Queue By Device array for aic7xxx host instance 0:
>
> {255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255}
> Actual queue depth per device for aic7xxx host instance 0:
> {1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1}
Hallo Albert,
you have tagged queuing disabled (Actual depth 1 on all targets) and
Tag Queue Enable Flags: 0x0000.
So your drive is working in dumb mode one command at a time without any
optimisation.
put some bootflag (see somewhere in the aicxxx doc) in lilo.conf.
Sorry I'm not at my Linux-Box right now so I can't look it up.
It's something like tag_queue{{0,0,0,0,,,,}} where 0 means "use
default".
If you enable it (-> Tag Queue Enable Flags: 0x[nonzero]) and the
actual depth is still 1 you can have a look with scsiinfo if the drive
has tagged queuing switched on.
regards,
K.-H.
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E-Mail: Karl-Heinz Herrmann <k.-h.herrmann@fz-juelich.de>
Date: 17-Mar-99 Time: 15:20:59
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