Date: Wed, 16 Dec 1998 11:35:00 +0000 From: Richard Smith <richard@jezebel.demon.co.uk> To: "Justin T. Gibbs" <gibbs@narnia.plutotech.com> Cc: scsi@FreeBSD.ORG Subject: Re: Update: ncr0: timeout problem Message-ID: <36779AE4.18B06075@jezebel.demon.co.uk> References: <199812152117.OAA59717@narnia.plutotech.com>
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Justin T. Gibbs wrote:
>
> > Over a month ago, I posted a timeout problem I was having with my
> > symbios controller and fujitsu drive, on 2.2.7R
> >
> > I have now upgraded to 3.0R and the problem although different, still
> > remains. I was advised at the time that the problem would be easier to
> > diagnose under 3.0, so here goes...
>
> My guess would be that the Fujitsu doesn't like getting lots of tags.
> CAM will actually send more transactions to the drive in parallel than
> the old SCSI code which could be making the problem worse than before.
> Unfortunately, my knowledge of the underlying NCR hardware is pretty
> limitted, so I can't say for sure that this is the cause of the problem.
>
> Try reducing the number of transactions that CAM sends to the drive
> and see if this helps. You can do this by adding a quirk entry
> for your drive in sys/cam/cam_xpt.c. Something like this should get
> you started:
>
> {
> /* Broken tagged queuing drive?? */
> { T_DIRECT, SIP_MEDIA_FIXED, "FUJITSU", "M2949E-512", "0134" },
> /*quirks*/0, /*mintags*/2, /*maxtags*/2
> },
>
> If this works, increment the maxtags value until it stops working.
:-(
I successfully managed to reduce the number of timeout messages to two:
ncr0: timeout nccb=0xf0857400
ncr0: timeout nccb=0xf085f800
So I guess the quirk entry was correctly picked up, but did not cure the
problem.
Thanks for your support.
-richard
_______________________________________________________________________
Richard Smith Assistant Chief Engineer TRL Technology Limited
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