The default fragment low/high thresholds are 3 and 4 MB. On devices with
only 32MB RAM, these settings may lead to OOM when many fragments that
cannot be reassembled are received. Decrease fragment low/high thresholds
to 384 and 512 kB on devices with less than 64 MB RAM.
Signed-off-by: Matthias Schiffer <mschiffer@universe-factory.net>
include $(INCLUDE_DIR)/version.mk
PKG_NAME:=base-files
include $(INCLUDE_DIR)/version.mk
PKG_NAME:=base-files
PKG_FLAGS:=nonshared
PKG_FILE_DEPENDS:=$(PLATFORM_DIR)/ $(GENERIC_PLATFORM_DIR)/base-files/
PKG_FLAGS:=nonshared
PKG_FILE_DEPENDS:=$(PLATFORM_DIR)/ $(GENERIC_PLATFORM_DIR)/base-files/
-set_vm_min_free() {
- mem="$(grep MemTotal /proc/meminfo | awk '{print $2}')"
+apply_defaults() {
+ local mem="$(awk '/^MemTotal:/ {print $2}' /proc/meminfo)"
+ local min_free frag_low_thresh frag_high_thresh
+
if [ "$mem" -gt 65536 ]; then # 128M
if [ "$mem" -gt 65536 ]; then # 128M
elif [ "$mem" -gt 32768 ]; then # 64M
elif [ "$mem" -gt 32768 ]; then # 64M
- val=8192
- elif [ "$mem" -gt 16384 ]; then # 32M
- val=1024
+ min_free=1024
+ frag_low_thresh=393216
+ frag_high_thresh=524288
- sysctl -qw vm.min_free_kbytes="$val"
+
+ sysctl -qw vm.min_free_kbytes="$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="$frag_high_thresh"
for CONF in /etc/sysctl.conf /etc/sysctl.d/*.conf; do
[ -f "$CONF" ] && sysctl -p "$CONF" -e >&-
done
for CONF in /etc/sysctl.conf /etc/sysctl.d/*.conf; do
[ -f "$CONF" ] && sysctl -p "$CONF" -e >&-
done