From owner-freebsd-questions  Sun Apr 19 12:38:55 1998
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To: Antti-Pekka Liedes <apl@mail.cs.hut.fi>
cc: questions@FreeBSD.ORG
Subject: Re: two AHA-2940 controllers: horrible performance 
In-reply-to: Your message of "Sun, 19 Apr 1998 20:17:04 +0300."
             <19980419201704.55876@hutcs.cs.hut.fi> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Sun, 19 Apr 1998 12:37:34 -0700
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>I just tried two Adaptec AHA-2940 SCSI controllers on a ppro 180 box running
>2.2.6-stable from today.  The first controller that has always been used in
>the machine worked as before, no problems, but the second controller had
>huge performance problems.  I tried a lone Sony SDT-7000 tape drive and a
>lone old IBM 0662 disk in the second controller, neither could transfer more
>than maybe few kB/s, being practically unusable.  I got some "Timedout SCB
>handled by another timeout" messages.  At least the tape drive has been
>working just a few days ago in my home box, a dual pentium with AHA-3940
>controller.  Here's parts of dmesg:
>ahc0 <Adaptec 2940 Ultra SCSI host adapter> rev 0 int a irq 15 on pci0:17:0
>ahc0: aic7880 Wide Channel, SCSI Id=7, 16 SCBs
>ahc0 waiting for scsi devices to settle
>(ahc0:1:0): "IBM DCAS-34330W S65A" type 0 fixed SCSI 2
>sd0(ahc0:1:0): Direct-Access 4134MB (8467200 512 byte sectors)
>(ahc0:2:0): "IBM DCAS-34330W S65A" type 0 fixed SCSI 2
>sd1(ahc0:2:0): Direct-Access 4134MB (8467200 512 byte sectors)
>...
>ahc1 <Adaptec 2940 SCSI host adapter> rev 0 int a irq 15 on pci0:20:0
>ahc1: aic7870 Single Channel, SCSI Id=7, 16 SCBs
>ahc1 waiting for scsi devices to settle
>(ahc1:5:0): "SONY SDT-7000 0150" type 1 removable SCSI 2
>st0(ahc1:5:0): Sequential-Access density code 0x13, 512-byte blocks,
>write-enabled
>
>any ideas?

   Incorrect termination setting on the second SCSI bus?

-DG

David Greenman
Co-founder/Principal Architect, The FreeBSD Project

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