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Date: Wed, 18 Mar 1998 17:22:17 -0500 (EST)
From: "Richard B. Johnson" <root@chaos.analogic.com>
To: Linux kernel <linux-kernel@vger.rutgers.edu>
Subject: Linux 2.1.90 memory management trouble
Hello,
2.2.90 has some problems with memory management that makes the system
fail to use available memory and start thrashing swap.
Executing:
# make clean
# make -j zImage &>World.Log &
.... from the linux directory will result in about 3 hours of swap-file
thrashing on a 166 MHz Pentium. It is possible to get some system
information, but the time to respond to shell commands is measured in
quarter-hours so I could not get too much information.
`ps` shows that most everything is in "wait_on_page".
`cat /proc/meminfo` shows there are plenty of resources not being used.
total: used: free: shared: buffers: cached:
Mem: 31498240 28475392 3022848 27500544 143360 8179712
Swap: 133885952 45293568 88592384
MemTotal: 30760 kB
MemFree: 2952 kB
MemShared: 26856 kB
Buffers: 140 kB
Cached: 7988 kB
SwapTotal: 130748 kB
SwapFree: 86516 kB
The compile did not complete:
gcc -D__KERNEL__ -I/usr/src/linux-2.1.90/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -m486 -malign-loops=2 -malign-jumps=2 -malign-functions=2 -DCPU=586 -c -o vmscan.o vmscan.c
gcc -D__KERNEL__ -I/usr/src/linux-2.1.90/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -m486 -malign-loops=2 -malign-jumps=2 -malign-functions=2 -DCPU=586 -c -o page_io.o page_io.c
gcc -D__KERNEL__ -I/usr/src/linux-2.1.90/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -m486 -malign-loops=2 -malign-jumps=2 -malign-functions=2 -DCPU=586 -c -o page_alloc.o page_alloc.c
gcc -D__KERNEL__ -I/usr/src/linux-2.1.90/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -m486 -malign-loops=2 -malign-jumps=2 -malign-functions=2 -DCPU=586 -c -o swap_state.o swap_state.c
gcc -D__KERNEL__ -I/usr/src/linux-2.1.90/include -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer -pipe -fno-strength-reduce -m486 -malign-loops=2 -malign-jumps=2 -malign-functions=2 -DCPU=586 -c -o swapfile.o swapfile.c
gcc: Internal compiler error: program cc1 got fatal signal 11
make[2]: *** [swap_state.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: *** Waiting for unfinished jobs....
make[2]: *** Waiting for unfinished jobs....
make[2]: *** Waiting for unfinished jobs....
make[2]: *** Waiting for unfinished jobs....
make[2]: *** Waiting for unfinished jobs....
make[2]: *** Waiting for unfinished jobs....
make[2]: *** Waiting for unfinished jobs....
make[2]: *** Waiting for unfinished jobs....
make[2]: *** Waiting for unfinished jobs....
make[2]: *** Waiting for unfinished jobs....
make[2]: Leaving directory `/usr/src/linux-2.1.90/mm'
make[1]: *** [first_rule] Error 2
make[1]: Leaving directory `/usr/src/linux-2.1.90/mm'
make: *** [linuxsubdirs] Error 2
Probably cc1 didn't check a pointer when it allocated some memory so
it got a SIGSEGV writing to NULL.
System info:
CONFIG_M586=y
CONFIG_MODULES=y
CONFIG_NET=y
CONFIG_PCI=y
CONFIG_PCI_BIOS=y
CONFIG_PCI_DIRECT=y
CONFIG_SYSVIPC=y
CONFIG_SYSCTL=y
CONFIG_BINFMT_AOUT=y
CONFIG_BINFMT_ELF=y
CONFIG_BLK_DEV_FD=y
CONFIG_PARIDE_PARPORT=y
CONFIG_PACKET=y
CONFIG_NETLINK=y
CONFIG_UNIX=y
CONFIG_INET=y
CONFIG_IP_NOSR=y
CONFIG_SKB_LARGE=y
CONFIG_SCSI=y
CONFIG_BLK_DEV_SD=y
CONFIG_CHR_DEV_ST=y
CONFIG_BLK_DEV_SR=y
CONFIG_SCSI_BUSLOGIC=y
CONFIG_SCSI_OMIT_FLASHPOINT=y
CONFIG_NETDEVICES=y
CONFIG_NET_ETHERNET=y
CONFIG_NET_ISA=y
CONFIG_NE2000=y
CONFIG_CDROM=y
CONFIG_EXT2_FS=y
CONFIG_ISO9660_FS=y
CONFIG_JOLIET=y
CONFIG_FAT_FS=y
CONFIG_MSDOS_FS=y
CONFIG_VFAT_FS=y
CONFIG_PROC_FS=y
CONFIG_NFS_FS=y
CONFIG_NFSD=y
CONFIG_SUNRPC=y
CONFIG_LOCKD=y
CONFIG_CODA_FS=y
CONFIG_NLS=y
CONFIG_VT=y
CONFIG_VT_CONSOLE=y
CONFIG_SERIAL=y
CONFIG_MAGIC_SYSRQ=y
CONFIG_VGA_CONSOLE=y
There seems to be some very agressive swapping going on. Even `pine` is
swapped out when I access another window!!
FLAGS UID PID PPID PRI NI SIZE RSS WCHAN STA TTY TIME COMMAND
100 0 1 0 0 0 212 40 S ? 0:04 init
40 0 2 1 0 0 0 0 bdflush SW ? 0:00 (kflushd)
40 0 3 1 -12 -12 0 0 SW< ? 0:34 (kswapd)
140 0 10 1 0 0 800 44 sigsuspend SW ? 0:00 update (bdflush)
40 0 31 1 0 0 844 80 sigsuspend SW ? 0:00 /usr/sbin/crond
140 0 47 1 0 0 284 104 do_select SW ? 0:00 /usr/sbin/syslogd
100140 0 49 1 0 0 444 0 SW ? 0:00 (klogd)
100140 1 51 1 0 0 864 236 do_select SW ? 0:00 /usr/sbin/rpc.portmap
100140 0 53 1 0 0 840 0 do_select SW ? 0:00 (inetd)
140 0 55 1 0 0 812 204 skb_recv_da SW ? 0:00 /usr/sbin/rwhod -t -s
100140 0 57 1 0 0 232 0 do_select SW ? 0:00 (lpd)
40 0 59 1 0 0 884 68 do_select SW ? 0:00 /usr/sbin/rpc.mountd
40 0 61 1 0 0 912 68 do_select SS ? 0:00 /usr/sbin/rpc.nfsd
100140 0 63 1 0 0 840 0 do_select SW ? 0:00 (rpc.pcnfsd)
140 0 73 1 12 0 1280 328 wait_for_co SS ? 0:00 sendmail: accepting connections
100040 0 81 1 0 0 828 0 wait_for_co SW ? 0:00 (rmtadm)
100140 0 83 1 0 0 1356 52 do_select S ? 0:00 /usr/sbin/httpd
100 0 84 1 15 0 1168 500 SW 1 0:00 -bash
100 0 85 1 0 0 1168 468 SW 2 0:00 -bash
0 0 86 1 0 0 128 0 read_chan SW 3 0:00 (agetty)
0 0 87 1 0 0 128 0 read_chan SW 4 0:00 (agetty)
0 0 88 1 0 0 128 0 read_chan SW 5 0:00 (agetty)
0 0 89 1 0 0 128 0 read_chan SW 6 0:00 (agetty)
100140 666 90 83 0 0 1356 4 do_select S ? 0:00 (httpd)
100100 0 803 84 17 0 356 336 R 1 0:00 ps laxw
100100 0 781 85 0 0 2604 1388 SW 2 0:00 pine
Cheers,
Dick Johnson
***** FILE SYSTEM MODIFIED *****
Penguin : Linux version 2.1.90 on an i586 machine (66.15 BogoMips).
Warning : It's hard to remain at the trailing edge of technology.
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