Hey,



> > also, if people could mail me dmesgs from any machines that have the problem,
> > that may be enlightening.

as I reported in some older emails.. I think I have a similar problem.
Since I upgraded with a G4 card (7400/400) I noteiced instabilities.
True is too that fiddling with different optimizations options made the 
problem come and go with different frequency.
Currently I have a kernel that didn't crash yet when I set the cache to
WT. Disabling the cache helps too. But "full cache" doesn't work, while
it seems to do in MacOS.

I don't remember where kernel optimizations options are set so I don't
know how the current kernel is compiled, but I believe "default".

dmesg:

Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 3.99.8 (gandalf_generic1) #27: Tue Aug 30 09:44:05 UTC 2005
        multix@gandalf:/usr/src/sys/arch/macppc/compile/gandalf_generic1
total memory = 320 MB
avail memory = 305 MB
mainbus0 (root)
cpu0 at mainbus0: 7400 (Revision 2.7), ID 0 (primary)
cpu0: HID0 8294c0a4<EMCP,ECLK,DOZE,DPM,EIEC,ICE,DCE,SGE,BTIC,BHT>
cpu0: 409.10 MHz, no-parity 1MB WT L2 cache (PB SRAM) at 2:1 ratio
bandit0 at mainbus0
pci0 at bandit0 bus 0
pci0: i/o space, memory space enabled
pchb0 at pci0 dev 11 function 0
pchb0: Apple Computer Bandit Host-PCI Bridge (rev. 0x03)
ofb0 at pci0 dev 15 function 0: Matrox MGA Millennium 2064W ("Storm")
ofb0: 640 x 480, 8bpp
wsdisplay0 at ofb0 kbdmux 1: console (std, vt100 emulation)
wsmux1: connecting to wsdisplay0
obio0 at pci0 dev 16 function 0: addr 0xf3000000
esp0 at obio0 offset 0x10000 irq 12: NCR53C94, 25MHz, SCSI ID 7
scsibus0 at esp0: 8 targets, 8 luns per target
mc0 at obio0 offset 0x11000: irq 14,2,3: address 00:a0:40:22:12:c1
zsc0 at obio0 offset 0x13000: irq 15,16
zstty0 at zsc0 channel 0
zstty1 at zsc0 channel 1
awacs at obio0 offset 0x14000 not configured
swim3 at obio0 offset 0x15000 not configured
adb0 at obio0 offset 0x16000 irq 18: 2 targets
aed0 at adb0 addr 0: ADB Event device
akbd0 at adb0 addr 2: extended keyboard
wskbd0 at akbd0: console keyboard, using wsdisplay0
ams0 at adb0 addr 3: 1-button, 100 dpi mouse
wsmouse0 at ams0 mux 0
mesh0 at obio0 offset 0x18000 irq 13: 50MHz, SCSI ID 7
scsibus1 at mesh0: 8 targets, 8 luns per target
nvram0 at obio0 offset 0x1d000
bandit1 at mainbus0
pci1 at bandit1 bus 1
pci1: i/o space, memory space enabled
pchb1 at pci1 dev 11 function 0
pchb1: Apple Computer Bandit Host-PCI Bridge (rev. 0x03)
scsibus0: waiting 2 seconds for devices to settle...
scsibus1: waiting 2 seconds for devices to settle...
probe(mesh0:0:0:0): max sync rate 10.00Mb/s
sd0 at scsibus1 target 0 lun 0: <QUANTUM, FIREBALL SE4.3S, PJ0A> disk
fixed
sd0: 4110 MB, 7637 cyl, 4 head, 275 sec, 512 bytes/sect x 8418816
sectors
probe(mesh0:0:1:0): max sync rate 10.00Mb/s
sd1 at scsibus1 target 1 lun 0: <IBM OEM, DFHSS4F, 4141> disk fixed
sd1: drive offline
probe(mesh0:0:3:0): max sync rate 5.00Mb/s
cd0 at scsibus1 target 3 lun 0: <MATSHITA, CD-ROM CR-8005A, 4.0i> cdrom
removable
boot device: sd1
root on sd1a dumps on sd1b
root file system type: ffs

-Riccardo