Date: Sun, 16 Apr 1995 12:56:53 -0400 From: moto@CS.cmu.edu To: freebsd-hackers@FreeBSD.org Subject: AHC2940 + Micropolis/Seagate w/wo tagged queueing Message-ID: <6567.798051413@GS81.SP.CS.CMU.EDU>
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Hi,
I have two types of drive (Micropolis 4221 and Seagate Barracuda I
(ST11950N)) and an AHA-2490. I did some experiments with these drives
enabling/disabling the tagged queueing option on 940412-SNAP. Here is
the result:
Machine: GATEWAY2000 P5-100
Controller: AHA-2940
Case 1) Kernel: 950412-SNAP stock
Drive: Seagate Barracuda I
Result: perfectly working (even with 10MB/s xfer rate).
Case 2) Kernel: 950412-SNAP recompiled with AHC_TAGENABLE
Drive: Seagate Barracuda I
Result: panics and reboots right after the drive is probed
no matter how fast the xfer rate is.
Case 3) Kernel: 950412-SNAP stock
Drive: Micropolis 4221
Result: working but up to 8MB/s. When 10MB/s is selected, timeout
occurs.
Case 4) Kernel: 950412-SNAP recompiled with AHC_TAGENABLE
Drive: Micropolis 4221
Result: timeout occurs even with 5MB/s xfer rate as before
(In either cases, only one SCSI drive is attached. No other SCSI
devices is present.)
I think that 950412 kernel is almost rock solid w.r.t. aha2940 driver,
but looks like it still has a subtle timing problem. Not to mention,
there is a possibility that this is just caused by a drive's firmware
problem, though. I'd like to hear an experience from other people who
are using aha2940. Thanks!
==============================================================================
Motonori Shindou Carnegie Mellon University SCS Graduate Student
e-mail: moto@cs.cmu.edu, NiftyServe: GEG04056
WWW: http://www.cs.cmu.edu:8001:/afs/cs.cmu.edu/user/moto/WWW/moto-home.html
TEL: 412-362-9636 FAX: 412-362-9634
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