From owner-freebsd-scsi  Sun Jul  4 13:49: 0 1999
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Date: Sun, 4 Jul 1999 22:49:07 +0200
From: Stefan Esser <se@mi.uni-koeln.de>
To: Andre Oppermann <oppermann@pipeline.ch>
Cc: freebsd-scsi@freebsd.org, Stefan Esser <se@freebsd.org>
Subject: Re: ncr0: queue is empty
Message-ID: <19990704224907.A2698@dialup124.mi.uni-koeln.de>
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References: <377B1E99.46188B0C@pipeline.ch> <19990702003518.B468@dialup124.mi.uni-koeln.de> <377C77C1.4F8ACEE1@pipeline.ch> <19990704111556.B4870@dialup124.mi.uni-koeln.de> <377F37E7.8B0F13D1@pipeline.ch>
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In-Reply-To: <377F37E7.8B0F13D1@pipeline.ch>; from Andre Oppermann on Sun, Jul 04, 1999 at 12:31:03PM +0200
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On 1999-07-04 12:31 +0200, Andre Oppermann <oppermann@pipeline.ch> wrote:
> Stefan Esser wrote:
> > 
> > On 1999-07-02 10:26 +0200, Andre Oppermann <oppermann@pipeline.ch> wrote:
> > > scbus0 on ncr0 bus 0:
> > > <Quantum XP34300 81HB>             at scbus0 target 0 lun 0 (pass0,da0)
> > > <TOSHIBA CD-ROM XM-3401TA 3593>    at scbus0 target 2 lun 0 (pass1,cd0)
> > > <MATSHITA PD-1 LF-1000 A109>       at scbus0 target 4 lun 0 (pass2,da1)
> > > <MATSHITA PD-1 LF-1000 A109>       at scbus0 target 4 lun 1 (pass3,cd1)
> > 
> > Many Quantum drives show erratic behaviour if confronted with too many
> > simultanous commands. For that reason, you may want to add a Quirk entry
> > for your drive to "/sys/cam/cam_xpt.c", similar to the existing entries
> > for all kinds of Atlas drives ...
> 
> What is an reasonable value for that drive?

I guess you want to try the values that work with other Quantum drives:

        {
                /* Reports QUEUE FULL for temporary resource shortages */
                { T_DIRECT, SIP_MEDIA_FIXED, quantum, "XP34550*", "*" },
                /*quirks*/0, /*mintags*/24, /*maxtags*/32
        },

The "reducing number of tags" message has been disabled on popular demand
a few months ago, IIRC. But you can re-enable it, though I don't remember
how ... (kernel config option ? verbose boot ? You'll find out easily by
greping for the origin of that message in the CAM sources ;-)

Regards, STefan


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