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Subject2.4.10 oom_killer
Date
I'm setting up a 2.4.10 (final) abi configured platform.

Running a legacy SCO appl (which heavily stresses the system),
I systematically get an oom_killer intervention.

Sometimes (not systematically) the system oopses after recursively killing
init (sorry I wasn't able to write it down).

It always triggers as soon as cache eats up all available memory.

The machine has a lot of swap (6.66 ramsize).

I tried to tune bdflush for vm to be less aggressive, with no results.

Browsing the list I understand this behaviour is still present in pre6.

Here some details:

root@master:/usr/ads/apoteca# ./systemtest 2>&1
reorganize prod test...

BCHECK C-ISAM B-tree Checker version 1.07
Copyright (C) 1981-1989 Informix Software, Inc.


C-ISAM Files: prod

Checking dictionary and file sizes.
index file node size = 1024
current C-ISAM index node size = 1024
Checking data file records.
Command terminated by signal 9
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Command being timed: "/usr/ads/ads/bcheck -y prod"
User time (seconds): 2.25
System time (seconds): 2.24
Percent of CPU this job got: 44%
Elapsed (wall clock) time (h:mm:ss or m:ss): 0:10.10
Average shared text size (kbytes): 0
Average unshared data size (kbytes): 0
Average stack size (kbytes): 0
Average total size (kbytes): 0
Maximum resident set size (kbytes): 0
Average resident set size (kbytes): 0
Major (requiring I/O) page faults: 24
Minor (reclaiming a frame) page faults: 50
Voluntary context switches: 0
Involuntary context switches: 0
Swaps: 0
File system inputs: 0
File system outputs: 0
Socket messages sent: 0
Socket messages received: 0
Signals delivered: 0
Page size (bytes): 4096
Exit status: 0

root@master:~# vmstat 5 1000
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 0 0 0 51320 1020 30048 0 0 58 1 109 21 2 1 97
0 0 0 0 51052 1020 30048 0 0 0 0 105 9 1 1 99
0 0 0 0 51052 1020 30048 0 0 0 0 101 5 0 0 100
1 0 0 0 51052 1020 30048 0 0 0 0 102 5 0 0 100
0 0 0 0 50812 1020 30076 0 0 6 0 114 32 2 1 97
0 0 0 0 50812 1020 30076 0 0 0 0 101 4 0 0 100
0 0 0 0 50812 1020 30076 0 0 0 0 102 7 0 0 100
0 0 0 0 50812 1020 30076 0 0 0 6 106 6 0 0 100
1 0 0 0 44596 1056 35344 0 0 1056 0 127 43 3 4 93
1 0 0 0 2584 1232 73372 0 0 9009 0 208 148 27 28 45
Killed

As it can be seen, it ooms before even attempting to swap.

root@master:/usr/ads/apoteca# free
total used free shared buffers cached
Mem: 94112 91276 2836 0 144 79020
-/+ buffers/cache: 12112 82000
Swap: 666648 3924 662724

root@master:/usr/ads/apoteca# dmesg
Linux version 2.4.10 (root@master) (gcc version 2.95.3 20010315 (release)) #1 Mon Oct 8 20:11:47 GMT 2001
BIOS-provided physical RAM map:
BIOS-e820: 0000000000000000 - 000000000009fc00 (usable)
BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved)
BIOS-e820: 00000000000e0000 - 0000000000100000 (reserved)
BIOS-e820: 0000000000100000 - 0000000006000000 (usable)
BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved)
BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
BIOS-e820: 00000000fffe0000 - 0000000100000000 (reserved)
On node 0 totalpages: 24576
zone(0): 4096 pages.
zone(1): 20480 pages.
zone(2): 0 pages.
Kernel command line: BOOT_IMAGE=Linuxabi-2.4.10 ro root=302
Initializing CPU#0
Detected 232.966 MHz processor.
Console: colour VGA+ 80x25
Calibrating delay loop... 465.30 BogoMIPS
Memory: 93892k/98304k available (1515k kernel code, 4024k reserved, 444k data, 220k init, 0k highmem)
Dentry-cache hash table entries: 16384 (order: 5, 131072 bytes)
Inode-cache hash table entries: 8192 (order: 4, 65536 bytes)
Mount-cache hash table entries: 2048 (order: 2, 16384 bytes)
Buffer-cache hash table entries: 4096 (order: 2, 16384 bytes)
Page-cache hash table entries: 32768 (order: 5, 131072 bytes)
CPU: Before vendor init, caps: 008001bf 008005bf 00000000, vendor = 2
CPU: L1 I Cache: 32K (32 bytes/line), D cache 32K (32 bytes/line)
CPU: After vendor init, caps: 008001bf 008005bf 00000000 00000000
CPU: After generic, caps: 008001bf 008005bf 00000000 00000000
CPU: Common caps: 008001bf 008005bf 00000000 00000000
CPU: AMD-K6tm w/ multimedia extensions stepping 02
Checking 'hlt' instruction... OK.
Checking for popad bug... OK.
POSIX conformance testing by UNIFIX
mtrr: v1.40 (20010327) Richard Gooch (rgooch@atnf.csiro.au)
mtrr: detected mtrr type: none
PCI: PCI BIOS revision 2.10 entry at 0xfdba1, last bus=0
PCI: Using configuration type 1
PCI: Probing PCI hardware
got res[1000:101f] for resource 4 of Intel Corporation 82371AB PIIX4 USB
Limiting direct PCI/PCI transfers.
Linux NET4.0 for Linux 2.4
Based upon Swansea University Computer Society NET3.039
Initializing RT netlink socket
Starting kswapd
VFS: Diskquotas version dquot_6.4.0 initialized
devfs: v0.116 (20010919) Richard Gooch (rgooch@atnf.csiro.au)
devfs: boot_options: 0x0
Detected PS/2 Mouse Port.
pty: 512 Unix98 ptys configured
Serial driver version 5.05c (2001-07-08) with HUB-6 MANY_PORTS MULTIPORT SHARE_IRQ SERIAL_PCI enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
ttyS01 at 0x02f8 (irq = 3) is a 16550A
Real Time Clock Driver v1.10e
block: 128 slots per queue, batch=16
RAMDISK driver initialized: 16 RAM disks of 7777K size 1024 blocksize
Uniform Multi-Platform E-IDE driver Revision: 6.31
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
PIIX4: IDE controller on PCI bus 00 dev 39
PIIX4: chipset revision 1
PIIX4: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0xffa0-0xffa7, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xffa8-0xffaf, BIOS settings: hdc:DMA, hdd:pio
hda: QUANTUM FIREBALL CR13.0A, ATA DISK drive
hdc: WDC WD200BB-00AUA1, ATA DISK drive
hdd: CRD-8160B, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: 25429824 sectors (13020 MB) w/418KiB Cache, CHS=1582/255/63, UDMA(33)
hdc: 39102336 sectors (20020 MB) w/2048KiB Cache, CHS=38792/16/63, UDMA(33)
hdd: ATAPI 16X CD-ROM drive, 128kB Cache, DMA
Uniform CD-ROM driver Revision: 3.12
ide-floppy driver 0.97.sv
Partition check:
/dev/ide/host0/bus0/target0/lun0:<7>LDM: DEBUG (ldm.c, 877): validate_partition_table: Found basic MS-DOS pa
rtition, not a dynamic disk.
p1 p2 p3 p4
/dev/ide/host0/bus1/target0/lun0:<7>LDM: DEBUG (ldm.c, 877): validate_partition_table: Found basic MS-DOS pa
rtition, not a dynamic disk.
[PTBL] [2434/255/63] p1 p2 p3 p4
Floppy drive(s): fd0 is 1.44M
FDC 0 is an 8272A
loop: loaded (max 8 devices)
ide-floppy driver 0.97.sv
SCSI subsystem driver Revision: 1.00
md: linear personality registered as nr 1
md: raid0 personality registered as nr 2
md: raid1 personality registered as nr 3
md: raid5 personality registered as nr 4
raid5: measuring checksumming speed
8regs : 344.400 MB/sec
32regs : 250.000 MB/sec
pII_mmx : 392.400 MB/sec
p5_mmx : 385.600 MB/sec
raid5: using function: pII_mmx (392.400 MB/sec)
md: md driver 0.90.0 MAX_MD_DEVS=256, MD_SB_DISKS=27
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
LVM version 0.9.1_beta2 by Heinz Mauelshagen (18/01/2001)
lvm -- Driver successfully initialized
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
IP: routing cache hash table of 512 buckets, 4Kbytes
TCP: Hash tables configured (established 8192 bind 8192)
NET4: Unix domain sockets 1.0/SMP for Linux NET4.0.
VFS: Mounted root (ext2 filesystem) readonly.
Freeing unused kernel memory: 220k freed
Adding Swap: 136512k swap-space (priority -1)
Adding Swap: 530136k swap-space (priority -2)
parport0: PC-style at 0x378 [PCSPP,TRISTATE]
parport0: cpp_daisy: aa5500ff(38)
parport0: assign_addrs: aa5500ff(38)
parport0: cpp_daisy: aa5500ff(38)
parport0: assign_addrs: aa5500ff(38)
lp0: using parport0 (polling).
CSLIP: code copyright 1989 Regents of the University of California
SLIP: version 0.8.4-NET3.019-NEWTTY-MODULAR (dynamic channels, max=256).
SLIP linefill/keepalive option.
PPP generic driver version 2.4.1
PPP Deflate Compression module registered
8139too Fast Ethernet driver 0.9.18a
eth0: RealTek RTL8139 Fast Ethernet at 0xc6886800, 00:60:52:09:4a:15, IRQ 9
eth0: Identified 8139 chip type 'RTL-8139A'
eth0: Setting 100mbps half-duplex based on auto-negotiated partner ability 40a1.
[bcheck:212]: set personality to 7000003
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
VM: killing process bcheck
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
VM: killing process bash
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
VM: killing process bash
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
VM: killing process httpd
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
VM: killing process vmstat
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
VM: killing process syslogd
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
__alloc_pages: 0-order allocation failed (gfp=0x1d2/0) from c012845e
VM: killing process sendmail

regards,

Dr. Eng. Mauro Tassinari
Computer Management Associates


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