Sysctl

Tuning linux with sysctl

Links

• https://www.kernel.org/doc/Documentation/sysctl/vm.txt
• https://klaver.it/linux/sysctl.conf
• https://wiki.mikejung.biz/Sysctl_tweaks

Tuning memory

vm.swappiness

Percentage of free memory before activating swap.

Default is 60

Links

• Understanding vm.swappiness
• https://major.io/2008/12/03/reducing-inode-and-dentry-caches-to-keep-oom-killer-at-bay/

vm.vfs_cache_pressure

Clear cache:

echo 1 > /proc/sys/vm/drop_caches

To free/clear all caches:

echo 3 > /proc/sys/vm/drop_caches