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Date: Sat, 13 Sep 1997 20:47:49 +0000
From: Josh Tiefenbach <josh@doun.org>
To: hackers@freebsd.org
Cc: josh@doun.org
Subject: Problems with NCR810/Micropolis disk.
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(I sent this to -scsi the other day, and didnt get any bites. Trying with
larger audience)

I've been having some difficulty with my ncr810 /  Micropolis 4743 (Stinger)
setup under both 2.2.2R and the 9/12 SNAP of 3.0. Relevant sections of dmesg:

Copyright (c) 1992-1997 FreeBSD Inc.
Copyright (c) 1982, 1986, 1989, 1991, 1993
	The Regents of the University of California. All rights reserved.
FreeBSD 3.0-970912-SNAP #0: Sat Sep 13 19:54:53 GMT 1997
    root@asherah.doun.org:/usr/src/sys/compile/ASHERAH
CPU: Pentium (199.90-MHz 586-class CPU)
  Origin = "GenuineIntel"  Id = 0x544  Stepping=4
  Features=0x8001bf<FPU,VME,DE,PSE,TSC,MSR,MCE,CX8,MMX>
real memory  = 67108864 (65536K bytes)
avail memory = 63455232 (61968K bytes)
Probing for devices on PCI bus 0:
chip0: <Host to PCI bridge (vendor=8086 device=7100)> rev 0x01 on pci0.0.0
chip1: <Intel 82371AB PCI to ISA bridge> rev 0x01 on pci0.1.0
chip2: <Intel 82371AB USB host controller> rev 0x01 int d irq 9 on pci0.1.2
chip3: <Intel 82371AB power management> rev 0x01 on pci0.1.3
ncr0: <ncr 53c810a fast10 scsi> rev 0x12 int a irq 10 on pci0.10.0
scbus0 at ncr0 bus 0
scbus0 target 0 lun 0: <MICROP 4743 S150> type 0 fixed SCSI 2
sd0 at scbus0 target 0 lun 0
sd0: Direct-Access 
sd0: 10.0 MB/s (100 ns, offset 8)

sd0: M_DISCONNECT received, but datapointer not saved:
	data=799b4 save=7a6b0 goal=7a6d4.
4100MB (8398600 512 byte sectors)
sd0: with 6512 cyls, 7 heads, and an average 184 sectors/track

While the drive works, it is *extremely* pokey. A dd from rsd0a to /dev/null
with no load at all clocked in at about 250k/s. Under Win95, the drive seems
to perfom quite well, and the benchmarks I've run there (mostly norton stuff)
seems to indicate that the drive motors along at a fast clip (compared to the
reference drives).

In searching the archives, the I found a post to -scsi circa 12/96 with the
exact same dmesg output (M_DISCONNEXT) involving an ncr810 and a 9GB
Micropolis drive, but no solution/explanation was offered.

Could this concievably be a hardware problem (ie, should I return the drive),
or is there something patently obvious that I'm missing?

josh

-- 
"Those who learn from history are doomed to have it repeated to them anyways" 
                       -- Larry Wall.