graphite-rust/kernel_tuning.txt at master · tureus/graphite-rust · GitHub

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# https://www.kernel.org/doc/Documentation/sysctl/vm.txt
# http://jmoiron.net/

# DEFAULTS
vm.dirty_background_bytes = 0
vm.dirty_background_ratio = 10
vm.dirty_expire_centisecs = 3000
vm.dirty_bytes = 0
vm.dirty_ratio = 20
vm.dirty_writeback_centisecs = 500
vm.dirtytime_expire_seconds = 43200

# FIRST TRY
sysctl -w vm.dirty_background_ratio=30 vm.dirty_ratio=60 vm.dirty_expire_centisecs=18000 vm.dirty_writeback_centisecs=3000

# SECOND TRY (smoothing out sync by disabling writeback thread (3000 -> 0))
sysctl -w vm.dirty_background_ratio=30 vm.dirty_ratio=60 vm.dirty_expire_centisecs=18000 vm.dirty_writeback_centisecs=0

# THIRD TRY (fixed a default schema bug which had artificially small number of dirty pages, kernel died in mysterious way and had iops storm. time to reel it back and run the dirty_writeback every once in a while)
# Wake up every 3 hours to flush data
sysctl -w vm.dirty_background_ratio=30 vm.dirty_ratio=60 vm.dirty_expire_centisecs=1080000 vm.dirty_writeback_centisecs=1080000

sysctl -w vm.dirty_background_ratio=30 vm.dirty_ratio=60 vm.dirty_expire_centisecs=1080000 vm.dirty_writeback_centisecs=1080000