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base-files: tune fragment queue thresholds for available system memory

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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>
This commit is contained in:
Matthias Schiffer 2018-03-05 09:13:53 +01:00
parent 6c194078db
commit 057369ae1f
No known key found for this signature in database
GPG key ID: 16EF3F64CB201D9C
2 changed files with 21 additions and 10 deletions
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2
package/base-files/Makefile
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@ -12,7 +12,7 @@ include $(INCLUDE_DIR)/version.mk
include $(INCLUDE_DIR)/feeds.mk
PKG_NAME:=base-files
PKG_RELEASE:=185
PKG_RELEASE:=186
PKG_FLAGS:=nonshared
PKG_FILE_DEPENDS:=$(PLATFORM_DIR)/ $(GENERIC_PLATFORM_DIR)/base-files/

29
package/base-files/files/etc/init.d/sysctl
View file

@ -3,22 +3,33 @@
START=11
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
val=16384
min_free=16384
elif [ "$mem" -gt 32768 ]; then # 64M
val=8192
elif [ "$mem" -gt 16384 ]; then # 32M
val=1024
min_free=8192
else
return
min_free=1024
frag_low_thresh=393216
frag_high_thresh=524288
fi
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="$frag_high_thresh"
}
start() {
set_vm_min_free
apply_defaults
for CONF in /etc/sysctl.conf /etc/sysctl.d/*.conf; do
[ -f "$CONF" ] && sysctl -p "$CONF" -e >&-
done