srmmu: out of nocache

[Joerg Platte <lists@naasa.net>]

Hi!

I have an old SS5 with 128 MB memory. Sometimes, the kernel seems to have some 
memory problems:
Mar 24 07:03:05 ferdi kernel: bitmap out: size 8800 used 6242 off 1248 len 16 
align 16 count 8816
Mar 24 07:03:05 ferdi kernel: srmmu: out of nocache 4096: 2252800/1597952
Mar 24 07:03:05 ferdi kernel: VM: killing process sendmail

Here is an actual memory overview: 

ferdi:~# cat /proc/meminfo
MemTotal:       125256 kB
MemFree:          6744 kB
Buffers:         17836 kB
Cached:          51156 kB
SwapCached:      13556 kB
Active:          73420 kB
Inactive:        33572 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:       125256 kB
LowFree:          6744 kB
SwapTotal:      249652 kB
SwapFree:       228840 kB
Dirty:             188 kB
Writeback:           0 kB
Mapped:          40640 kB
Slab:             7736 kB
Committed_AS:   141536 kB
PageTables:        856 kB
VmallocTotal:    25600 kB
VmallocUsed:       500 kB
VmallocChunk:    25060 kB

These problems are reproducible under high load (e. g. updating spamassassins 
bayes-database while receiving a lot of mails). What can I do to fix this 
behaviour? Are 128 MB memory not enough? My x86-bases systems have no 
problems with less memory...

regards,
Jörg