Hi,
I have an ibook that has a broken ata controller and thus I boot and run the OS
off an USB stick. It ran fine for months on a 512 MB stick until 3.9 which
increased the size (I think of the libraries) of OpenBSD, I switched to a 1 gig
stick which surprisingly came down in cost the last little while.
I've configured the system to use disk as little as possible, it uses a small
MFS for /tmp, processes like cron are disabled, syslogd writes to its memory
ringbuffers, filesystems when possible are noatime. However on the led on the
USB stick I notice a disk operation every 3 seconds or so. I ktraced every
process and found that none is writing or reading, so it must come from the
kernel. What operation in the kernel causes reads / writes like this? I
originally thought update does this but I'm sorta skeptical since there is
nothing to write/sync to the filesystem..
Here is some data if it helps any..
$ df -h
Filesystem Size Used Avail Capacity Mounted on
/dev/sd0a 815M 515M 259M 67% /
mfs:21581 15.7M 6.0K 14.9M 0% /tmp
$ mount
/dev/sd0a on / type ffs (local, noatime)
mfs:21581 on /tmp type mfs (asynchronous, local, nodev, nosuid, size=32768
512-blocks)
$ ps ax
PID TT STAT TIME COMMAND
1 ?? Is 0:00.01 /sbin/init
21581 ?? Is 0:00.02 /sbin/mount_mfs -o rw -s 32768 -o nodev -o nosuid
/dev/sd0
2635 ?? Is 0:00.01 dhclient: gem0 (dhclient)
6060 ?? Is 0:00.01 syslogd: [priv] (syslogd)
25663 ?? I 0:00.23 syslogd -a /var/empty/dev/log -s
/var/run/syslogd.sock -a
193 ?? Is 0:00.01 /usr/sbin/apmd
11319 ?? Is 0:13.87 SCREEN (screen)
6351 p0 Is 0:00.08 /bin/ksh
29520 p0 I+ 0:00.06 /usr/bin/cu -l /dev/cuaU0 -s 9600
25830 p0 I+ 0:01.30 /usr/bin/cu -l /dev/cuaU0 -s 9600
3676 p1 Is 0:00.07 /bin/ksh
4394 p1 R+ 0:00.01 ps -ax
11940 C0- I 0:00.00 dhclient: gem0 [priv] (dhclient)
12415 C0 Is 0:01.10 -ksh (ksh)
24495 C0 I+ 0:00.03 screen
$
[ using 338996 bytes of bsd ELF symbol table ]
console out [ATY,RageM3p29s]console in [keyboard] ADB found
: memaddr 94000000 size 4000000, : consaddr 96008000, : ioaddr 90020000, size
20000: memtag 8000, iotag 8000: width 1024 linebytes 1024 height 768 depth 8
Copyright (c) 1982, 1986, 1989, 1991, 1993
The Regents of the University of California. All rights reserved.
Copyright (c) 1995-2006 OpenBSD. All rights reserved. http://www.OpenBSD.org
OpenBSD 3.9 (GENERIC) #853: Tue Feb 28 22:42:40 MST 2006
[EMAIL PROTECTED]:/usr/src/sys/arch/macppc/compile/GENERIC
real mem = 134217728 (131072K)
avail mem = 110862336 (108264K)
using 1254 buffers containing 6709248 bytes (6552K) of memory
mainbus0 (root): model PowerBook4,1
cpu0 at mainbus0: 750 (Revision 0x2214): 499 MHz: 256KB backside cache
memc0 at mainbus0: uni-n
ki2c0 at memc0 offset 0xf8001000
iic0 at ki2c0
mpcpcibr0 at mainbus0 pci: uni-north, Revision 0xff
pci0 at mpcpcibr0 bus 0
pchb0 at pci0 dev 11 function 0 "Apple Pangea AGP" rev 0x00
vgafb0 at pci0 dev 16 function 0 "ATI Mobility M3" rev 0x02, mmio
wsdisplay0 at vgafb0 mux 1: console (std, vt100 emulation)
mpcpcibr1 at mainbus0 pci: uni-north, Revision 0x0
pci1 at mpcpcibr1 bus 0
pchb1 at pci1 dev 11 function 0 "Apple Pangea" rev 0x00
macobio0 at pci1 dev 23 function 0 "Apple Pangea Macio" rev 0x00
openpic0 at macobio0 offset 0x40000: version 0x4614
macgpio0 at macobio0 offset 0x50
macgpio1 at macgpio0 irq 47
"programmer-switch" at macgpio0 not configured
"firewire-linkon" at macgpio0 not configured
"gpio1" at macgpio0 not configured
"gpio9" at macgpio0 not configured
"extint-gpio4" at macgpio0 not configured
"extint-gpio12" at macgpio0 not configured
"escc-legacy" at macobio0 offset 0x12000 not configured
zsc0 at macobio0 offset 0x13000: irq 22,23
zstty0 at zsc0 channel 0
zstty1 at zsc0 channel 1
tumbler0 at macobio0 offset 0x10000: irq 30,1,2
"timer" at macobio0 offset 0x15000 not configured
adb0 at macobio0 offset 0x16000 irq 25: via-pmu, 3 targets
akbd0 at adb0 addr 2: PowerBook G4 keyboard (Inverted T)
wskbd0 at akbd0: console keyboard, using wsdisplay0
ams0 at adb0 addr 3: EMP trackpad <tpad> 2-button, 400 dpi
wsmouse0 at ams0 mux 0
abtn0 at adb0 addr 7: brightness/volume/eject buttons
apm0 at adb0: battery flags 0x5, 100% charged
"battery" at macobio0 offset 0x0 not configured
"backlight" at macobio0 offset 0xf300 not configured
ki2c1 at macobio0 offset 0x18000
iic1 at ki2c1
wdc0 at macobio0 offset 0x1f000 irq 19: DMA
wd0 at wdc0 channel 0 drive 0: <IBM-IC25N015ATDA04-0>
wd0: 16-sector PIO, LBA, 14403MB, 29498112 sectors
wd0(wdc0:0:0): using PIO mode 4, DMA mode 2, Ultra-DMA mode 4
audio0 at tumbler0
ohci0 at pci1 dev 24 function 0 "Apple Pangea USB" rev 0x00: irq 27, version 1.0
usb0 at ohci0: USB revision 1.0
uhub0 at usb0
uhub0: Apple OHCI root hub, rev 1.00/1.00, addr 1
uhub0: 2 ports with 2 removable, self powered
ohci1 at pci1 dev 25 function 0 "Apple Pangea USB" rev 0x00: irq 28, version 1.0
usb1 at ohci1: USB revision 1.0
uhub1 at usb1
uhub1: Apple OHCI root hub, rev 1.00/1.00, addr 1
uhub1: 2 ports with 2 removable, self powered
mpcpcibr2 at mainbus0 pci: uni-north, Revision 0x16
pci2 at mpcpcibr2 bus 0
pchb2 at pci2 dev 11 function 0 "Apple Pangea PCI" rev 0x00
"Apple Pangea FireWire" rev 0x00 at pci2 dev 14 function 0 not configured
gem0 at pci2 dev 15 function 0 "Apple Pangea GMAC" rev 0x00: irq 41, address
00:03:93:14:3f:be
bmtphy0 at gem0 phy 0: BCM5221 100baseTX PHY, rev. 3
uplcom0 at uhub1 port 1
uplcom0: ATEN International Serial, rev 1.10/0.01, addr 2
ucom0 at uplcom0
umass0 at uhub0 port 1 configuration 1 interface 0
umass0: CHEER USB_DISK, rev 2.00/2.00, addr 2
umass0: using SCSI over Bulk-Only
scsibus0 at umass0: 2 targets
sd0 at scsibus0 targ 1 lun 0: <CHEER, USB_DISK, 1.00> SCSI2 0/direct removable
sd0: 1010MB, 1010 cyl, 64 head, 32 sec, 512 bytes/sec, 2069760 sec total
bootpath: '/[EMAIL PROTECTED]/[EMAIL PROTECTED]/[EMAIL PROTECTED]/bsd'
string [/[EMAIL PROTECTED]/[EMAIL PROTECTED]/bsd] not found
Warning: bootpath unrecognized: /[EMAIL PROTECTED]/[EMAIL PROTECTED]/[EMAIL
PROTECTED]/bsd
boot device: lookup '' failed.
root device : sd0
swap device (default sd0b):
root on sd0a
usb_transfer_complete: xfer=0xe01fb680 not busy 0x42555359
rootdev=0x200 rrootdev=0x800 rawdev=0x802
wd0(wdc0:0:0): timeout
type: ata
c_bcount: 0
c_skip: 0
$
Cheers,
-p
