Message-ID: <BLU103-DAV550703C13BE5EF0DDF51AD6740@phx.gbl>
Date:	Sun, 25 Nov 2007 15:02:15 -0700
From:	"Josh Goldsmith" <joshin@...mail.com>
To:	<linux-kernel@...r.kernel.org>
Subject: Small System Paging Problem - OOM-killer goes nuts

Hi,

  I have a Linksys NSLU2 running 2.6.21 (I can replicate the problem on 
2.6.23 but it isn't fully supported on SlugOS).  It is a armv5teb device 
with 32MB of RAM, 400+ MB swap on its 160GB USB2 root disk.  The machine is 
used as a fileserver and to build packages for other ARM devices.  It may be 
underpowered by today's standard but is a whole lot faster than my first 
Linux system (386sx20 with 4MB RAM) but the whole system with disk uses <8 
watts and is silent.

  The problem comes when I try to untar a large file (in this case 
linux-2.6.23.tar.bz2).  Regardless if I kill off every other process, 
eventually the oom-killer will appear and kill either the tar or the shell. 
I've tried every tuning option I and my buddy Google could find including 
(/proc/sys/vm/overcommit*) with no success.  I'm not worried about paging 
impacting performance.

  I'd appreciate any help, pointers, or gentle taps with the cluebat.

-Josh

Error output to console: http://www.pastebin.ca/797155

config ->  http://www.pastebin.ca/797206

slug2>$ uname -a
Linux slug2 2.6.21 #1 PREEMPT Fri Nov 9 11:54:06 MST 2007 armv5teb unknown

slug2:~$ free
             total       used       free     shared    buffers     cached
Mem:         30352      29124       1228          0      10196       9468
-/+ buffers/cache:       9460      20892
Swap:       465876          0     465876

cat /proc/swaps
Filename                                Type            Size    Used 
Priority
/dev/sda4                               partition       465876  0       -1

slug2:~$ lsmod
Module                  Size  Used by
nfsd                  186556  8
exportfs                4320  1 nfsd
lockd                  51416  2 nfsd
sunrpc                131952  2 nfsd,lockd
reiserfs              255380  1
ixp4xx_mac             14644  0
ixp4xx_qmgr             5388  5 ixp4xx_mac
mii                     3424  1 ixp4xx_mac
ext3                  110472  2
jbd                    47784  1 ext3
mbcache                 5604  1 ext3
ohci_hcd               16804  0
ehci_hcd               30252  0

slug2>$ dmesg
<5>Linux version 2.6.21 (josh@...x) (gcc version 4.1.1) #1 PREEMPT Fri Nov 9 
11:54:06 MST 2007
<4>CPU: XScale-IXP42x Family [690541f1] revision 1 (ARMv5TE), cr=000039ff
<4>Machine: Linksys NSLU2
<4>Memory policy: ECC disabled, Data cache writeback
<7>On node 0 totalpages: 8192
<7>  DMA zone: 64 pages used for memmap
<7>  DMA zone: 0 pages reserved
<7>  DMA zone: 8128 pages, LIFO batch:0
<7>  Normal zone: 0 pages used for memmap
<4>CPU0: D VIVT undefined 5 cache
<4>CPU0: I cache: 32768 bytes, associativity 32, 32 byte lines, 32 sets
<4>CPU0: D cache: 32768 bytes, associativity 32, 32 byte lines, 32 sets
<4>Built 1 zonelists.  Total pages: 8128
<5>Kernel command line: rtc-x1205.probe=0,0x6f console=ttyS0,115200n8 
root=/dev/mtdblock4 rootfstype=jffs2 rw init=/linuxrc noirqdebug
<6>IRQ lockup detection disabled
<4>PID hash table entries: 128 (order: 7, 512 bytes)
<4>Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
<4>Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
<6>Memory: 32MB = 32MB total
<5>Memory: 30268KB available (1940K code, 154K data, 84K init)
<7>Calibrating delay loop... 266.24 BogoMIPS (lpj=1331200)
<4>Mount-cache hash table entries: 512
<6>CPU: Testing write buffer coherency: ok
<6>NET: Registered protocol family 16
<4>IXP4xx: Using 16MiB expansion bus window size
<4>PCI: IXP4xx is host
<4>PCI: IXP4xx Using direct access for memory space
<6>PCI: bus0: Fast back to back transfers disabled
<6>dmabounce: registered device 0000:00:01.0 on pci bus
<6>dmabounce: registered device 0000:00:01.1 on pci bus
<6>dmabounce: registered device 0000:00:01.2 on pci bus
<5>SCSI subsystem initialized
<6>usbcore: registered new interface driver usbfs
<6>usbcore: registered new interface driver hub
<6>usbcore: registered new device driver usb
<6>Time: OSTS clocksource has been installed.
<6>NET: Registered protocol family 2
<4>IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
<4>TCP established hash table entries: 1024 (order: 1, 8192 bytes)
<4>TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
<6>TCP: Hash tables configured (established 1024 bind 1024)
<6>TCP reno registered
<4>NetWinder Floating Point Emulator V0.97 (double precision)
<6>JFFS2 version 2.2. (NAND) (C) 2001-2006 Red Hat, Inc.
<6>io scheduler noop registered
<6>io scheduler deadline registered (default)
<6>Serial: 8250/16550 driver $Revision: 1.90 $ 2 ports, IRQ sharing disabled
<6>serial8250.0: ttyS0 at MMIO 0xc8000000 (irq = 15) is a XScale
<6>serial8250.0: ttyS1 at MMIO 0xc8001000 (irq = 13) is a XScale
<4>RAMDISK driver initialized: 4 RAM disks of 10240K size 1024 blocksize
<6>IXP4XX NPE driver Version 0.3.0 initialized
<6>NFTL driver: nftlcore.c $Revision: 1.98 $, nftlmount.c $Revision: 1.41 $
<6>IXP4XX-Flash.0: Found 1 x16 devices at 0x0 in 16-bit bank
<7>IXP4XX-Flash.0: Found an alias at 0x800000 for the chip at 0x0
<4> Intel/Sharp Extended Query Table at 0x0031
<6>Using buffer write method
<5>cfi_cmdset_0001: Erase suspend on write enabled
<7>erase region 0: offset=0x0,size=0x20000,blocks=64
<5>Searching for RedBoot partition table in IXP4XX-Flash.0 at offset 
0x7e0000
<5>6 RedBoot partitions found on MTD device IXP4XX-Flash.0
<5>Creating 6 MTD partitions on "IXP4XX-Flash.0":
<5>0x00000000-0x00040000 : "RedBoot"
<6>nslu2 mac: 00:0f:66:7c:14:23
<5>0x00040000-0x00060000 : "SysConf"
<5>0x00060000-0x00080000 : "Loader"
<5>0x00080000-0x00180000 : "Kernel"
<5>0x00180000-0x007e0000 : "Flashdisk"
<5>0x007e0000-0x00800000 : "FIS directory"
<4>npe: searching for firmware...
<6>npe: found at 0x1c010, IXP425/NPE-B func: 00, rev: 2.1, size: 11964, id: 
01000201
<6>Image loaded to NPE-B Func:0, Rel: 2:1, Status: 80800000
<6>Initializing USB Mass Storage driver...
<6>usbcore: registered new interface driver usb-storage
<6>USB Mass Storage support registered.
<6>input: ixp4xx beeper as /class/input/input0
<6>i2c /dev entries driver
<6>x1205 0-006f: chip found, driver version 1.0.7
<6>x1205 0-006f: rtc core: registered x1205 as rtc0
<6>Registered led device: ready
<6>Registered led device: status
<6>Registered led device: disk-1
<6>Registered led device: disk-2
<6>TCP cubic registered
<6>NET: Registered protocol family 1
<6>NET: Registered protocol family 17
<6>XScale DSP coprocessor detected.
<6>x1205 0-006f: setting the system clock to 2007-11-25 20:35:07 
(1196022907)
<4>VFS: Mounted root (jffs2 filesystem).
<6>Freeing init memory: 84K
<4>PCI: enabling device 0000:00:01.2 (0140 -> 0142)
<6>ehci_hcd 0000:00:01.2: EHCI Host Controller
<6>ehci_hcd 0000:00:01.2: new USB bus registered, assigned bus number 1
<6>ehci_hcd 0000:00:01.2: irq 26, io mem 0x48002000
<6>ehci_hcd 0000:00:01.2: USB 2.0 started, EHCI 1.00, driver 10 Dec 2004
<6>usb usb1: configuration #1 chosen from 1 choice
<6>hub 1-0:1.0: USB hub found
<6>hub 1-0:1.0: 5 ports detected
<7>ohci_hcd: 2006 August 04 USB 1.1 'Open' Host Controller (OHCI) Driver
<4>PCI: enabling device 0000:00:01.0 (0140 -> 0142)
<6>ohci_hcd 0000:00:01.0: OHCI Host Controller
<6>ohci_hcd 0000:00:01.0: new USB bus registered, assigned bus number 2
<6>ohci_hcd 0000:00:01.0: irq 28, io mem 0x48000000
<6>usb usb2: configuration #1 chosen from 1 choice
<6>hub 2-0:1.0: USB hub found
<6>hub 2-0:1.0: 3 ports detected
<4>PCI: enabling device 0000:00:01.1 (0140 -> 0142)
<6>ohci_hcd 0000:00:01.1: OHCI Host Controller
<6>usb 1-1: new high speed USB device using ehci_hcd and address 2
<6>ohci_hcd 0000:00:01.1: new USB bus registered, assigned bus number 3
<6>ohci_hcd 0000:00:01.1: irq 27, io mem 0x48001000
<6>usb usb3: configuration #1 chosen from 1 choice
<6>hub 3-0:1.0: USB hub found
<6>hub 3-0:1.0: 2 ports detected
<6>usb 1-1: configuration #1 chosen from 1 choice
<6>scsi0 : SCSI emulation for USB Mass Storage devices
<7>usb-storage: device found at 2
<7>usb-storage: waiting for device to settle before scanning
<5>scsi 0:0:0:0: Direct-Access     Maxtor   3200             0344 PQ: 0 
ANSI: 4
<5>SCSI device sda: 312581808 512-byte hdwr sectors (160042 MB)
<5>sda: Write Protect is off
<7>sda: Mode Sense: 17 00 00 00
<3>sda: assuming drive cache: write through
<5>SCSI device sda: 312581808 512-byte hdwr sectors (160042 MB)
<5>sda: Write Protect is off
<7>sda: Mode Sense: 17 00 00 00
<3>sda: assuming drive cache: write through
<6> sda: sda1 sda2 sda3 sda4
<5>sd 0:0:0:0: Attached scsi disk sda
<7>usb-storage: device scan complete
<6>kjournald starting.  Commit interval 60 seconds
<6>EXT3 FS on sda1, internal journal
<6>EXT3-fs: recovery complete.
<6>EXT3-fs: mounted filesystem with journal data mode.
<6>IXP4XX Q Manager 0.2.1 initialized.
<6>ixp4xx_mac driver 0.3.1: eth0 on NPE-B with PHY[1] initialized
<5>ReiserFS: sda3: found reiserfs format "3.6" with standard journal
<5>ReiserFS: sda3: using ordered data mode
<5>ReiserFS: sda3: journal params: device sda3, size 8192, journal first 
block 18, max trans len 1024, max batch 900, max commit age 30, max trans 
age 30
<5>ReiserFS: sda3: checking transaction log (sda3)
<6>kjournald starting.  Commit interval 5 seconds
<4>EXT3-fs warning: maximal mount count reached, running e2fsck is 
recommended
<6>EXT3 FS on sda2, internal journal
<6>EXT3-fs: recovery complete.
<6>EXT3-fs: mounted filesystem with journal data mode.
<5>ReiserFS: sda3: replayed 237 transactions in 21 seconds
<5>ReiserFS: sda3: Using r5 hash to sort names
<6>Adding 465876k swap on /dev/sda4.  Priority:-1 extents:1 across:465876k
<6>eth0: link up, 100Mbps, full-duplex, lpa 0x45E1
<7>Link of eth0 is full-duplex
<6>Installing knfsd (copyright (C) 1996 okir@...ad.swb.de).
<4>NFSD: Using /var/lib/nfs/v4recovery as the NFSv4 state recovery directory
<4>NFSD: starting 90-second grace period 

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