Shachar Shemesh wrote:
Machine with 16GB ram and a bit of swap, running 32bit gentoo with (as
far as I know) 3:1 memory split.
The symptoms:
Every so often the oom-killer kicks in, for no apparent reason. The
processes it kills appear to be randomly chosen. Monitoring was not
turned on, but there is no reason to suspect the 16GB+swap were nowhere
near exhausted at the time.
My suggested diagnosis and recommendations:
The kernel only has 1GB with which to work, which causes it to run out
of memory for managing the page tables. I recommended they:
Possible. Checking /proc/meminfo can be helpful.
- As a first stage, disable the swap.
This doesn't make much sense to me. What is it suppose to achieve?
Try to turn on the CONFIG_HIGHPTE kernel config options. It puts (some
of the) page tables in high memory.
- As a second stage - switch to a 64bit kernel
Certainly a good idea if possible. Will be faster then CONFIG_HIGHPTE.
Also, is there any way to monitor how much kernel memory is in use? It
seems that monitoring the "LowTotal" and "LowFree" values in
/proc/meminfo may be what I'm looking for, but I'm not sure I'm reading
the docs proprely.
Basically, you need enough free space in LowFree, for some definition of
"enough".
Gilad
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