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Subject2.2.13 Problem running in 4MB RAM
Date


Hi !

hope this is not offtopic for here...

Kernel 2.2.13 running in 4MB RAM gives me Bus Errors that don't
kill the box but make it more or less unusable . The problem
is load independant , that is bus-errors will occure after booting
it without any real load on the system . If I put 8MB-RAM in the box
( + 4RAM-DISK ) the problem goes away and even with heavy load no bus
errors occure. since this error occures with ALL applications I guess its
not a problem of the applications or the libs but a memory management
problem.

this is the output of /proc/meminfo wherby 4MB ar a RAM-DISK (in which
Linux is running , no harddisk on this system -> no swap ) there seems
to plenty of memory free , and this will not change when bus errors occure.

Memory Usage:
-------------
total: used: free: shared: buffers: cached:
Mem: 7196672 6955008 241664 389120 3538944 499712
Swap: 0 0 0
MemTotal: 7028 kB
MemFree: 236 kB
MemShared: 380 kB
Buffers: 3456 kB
Cached: 488 kB
SwapTotal: 0 kB
SwapFree: 0 kB

the dmesg output of the system:
-------------------------------
Kernel Messages
Linux version 2.2.13-RTL2.0 (root@Cerebrum) (gcc version egcs-2.91.66 19990314
(egcs-1.1.2 release)) #3 Thu Nov 11 18:22:44 MET 1999
Console: colour VGA+ 80x25
Calibrating delay loop... 37.27 BogoMIPS
Memory: 6272k/8448k available (644k kernel code, 412k reserved, 364k data, 36k
init)
Checking if this processor honours the WP bit even in supervisor mode... Ok.
CPU: Intel 486 DX/4 stepping 00
Checking 386/387 coupling... OK, FPU using exception 16 error reporting.
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
RTL started
PCI: No PCI bus detected
Linux NET4.0 for Linux 2.2
Based upon Swansea University Computer Society NET3.039
NET4: Unix domain sockets 1.0 for Linux NET4.0.
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP
Starting kswapd v 1.5
Real Time Clock Driver v1.09
RAM disk driver initialized: 16 RAM disks of 4096K size
Floppy drive(s): fd0 is 1.44M
FDC 0 is a post-1991 82077
RAMDISK: Compressed image found at block 0
RAMDISK: Uncompressing root archive: done.
RAMDISK: Auto Filesystem - minix: 1365i 4096bk 47fdz(47) 1024zs 2147483647ms
VFS: Mounted root (minix filesystem).
RAMDISK: Extracting root archive: done.
VFS: Disk change detected on device fd(2,0)
Freeing unused kernel memory: 36k freed
eth0: 3c509 at 0x300 tag 1, 10baseT port, address 00 a0 24 40 dc 7e, IRQ 10.
3c509.c:1.16 (2.2) 2/3/98 becker@cesdis.gsfc.nasa.gov.


Kernel is 2.2.13 with initrd , linuxrc and rtlinux2.0 patches applied

Any ideas what is going on , or where to start looking for the problem ?

thx
nmg

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