Out-of-memory wrong setting?

Banana Pi BPI-R4/BPI-R3 Mini/BPI-R3/BPI-R64/BPI-R2
1

Hi

i recognized out-of-memory messages in dmesg, and guess the memory-block in dts is wrong

actual value is afair changed by a patch from lede (in mainline same value is used but in 4.14 it is 0x40000000)

https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/arch/arm/boot/dts/mt7623n-bananapi-bpi-r2.dts?h=v4.14.64#n102

@moore @linkerosa @Ryder.Lee

can anybody explain me the values? how is size of memory calculated

regards Frank

2

base = 0x80000000 size = 0x80000000 for (2GB RAM)

1 Like
3

So it should be correct…any suggestion to prevent oom-messages? I tried vm-settings in /etc/sysctl.conf

# Prevent OOM killer (Out of Memory) which causes the server to crash
vm.overcommit_memory = 2
vm.overcommit_ratio = 80
4

It may caused by … 1.try to run too many features in run time 2.app/driver has memory leak issue

I will suggest to dump free memory regularly after system boot up to see the trend of free memory, thanks.

5

System should swap if there is too few memory.

I have this issue after near 15 days (in dmesg)

And aditional to router function i have 2 lxc vms running (webserver+mysql,vncserver+firefox)

Which command do you suggest to get (per-app) memory usage (ps?)?

6

linux kernel will try to kill applications to free more memory to satisfy the need. you can use ps or top command to show the memory usage, thanks.

ps -eo pid,ppid,cmd,%mem,%cpu --sort=-%mem | head

top -b -o +%MEM | head -n 20