openwrt_lede/package/base-files/files/etc/init.d/sysctl

#!/bin/sh /etc/rc.common
# Copyright (C) 2006 OpenWrt.org

START=11

apply_defaults() {
	local mem="$(awk '/^MemTotal:/ {print $2}' /proc/meminfo)"
	local min_free frag_low_thresh frag_high_thresh

	if [ "$mem" -gt 65536 ]; then # 128M
		min_free=16384
	elif [ "$mem" -gt 32768 ]; then # 64M
		min_free=8192
	else
		min_free=1024
		frag_low_thresh=393216
		frag_high_thresh=524288
	fi

	sysctl -qw vm.min_free_kbytes="$min_free"

	[ "$frag_low_thresh" ] && sysctl -qw \
		net.ipv4.ipfrag_low_thresh="$frag_low_thresh" \
		net.ipv4.ipfrag_high_thresh="$frag_high_thresh" \
		net.ipv6.ip6frag_low_thresh="$frag_low_thresh" \
		net.ipv6.ip6frag_high_thresh="$frag_high_thresh" \
		net.netfilter.nf_conntrack_frag6_low_thresh="$frag_low_thresh" \
		net.netfilter.nf_conntrack_frag6_high_thresh="$frag_high_thresh"
}

start() {
	apply_defaults
	for CONF in /etc/sysctl.conf /etc/sysctl.d/*.conf; do
		[ -f "$CONF" ] && sysctl -p "$CONF" -e >&-
	done
}