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authorMatthias Schiffer <mschiffer@universe-factory.net>2018-03-05 09:13:53 +0100
committerMatthias Schiffer <mschiffer@universe-factory.net>2018-03-07 19:14:22 +0100
commit057369ae1f3ad8d10b1a9e0baa5b63bc2b9087f5 (patch)
treef5a6b71c907f06f633e58938166802de794f1ea4 /package/base-files/files
parent6c194078db6958e349114c8605304a7b87edae3e (diff)
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base-files: tune fragment queue thresholds for available system memory
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>
Diffstat (limited to 'package/base-files/files')
-rwxr-xr-xpackage/base-files/files/etc/init.d/sysctl29
1 files changed, 20 insertions, 9 deletions
diff --git a/package/base-files/files/etc/init.d/sysctl b/package/base-files/files/etc/init.d/sysctl
index 3a497fb66c..65e6aa9925 100755
--- a/package/base-files/files/etc/init.d/sysctl
+++ b/package/base-files/files/etc/init.d/sysctl
@@ -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