From 5c9cc7b7f8920944a413644e1c2ea23bfe655bcb Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@nbd.name>
Date: Mon, 1 Aug 2016 14:52:13 +0200
Subject: [PATCH] base-files: increase vm.min_free_kbytes
Network drivers typically allocate memory in atomic context. For that to
be reliable, there needs to be enough free memory. Set the value
heuristically based on the total amount of system RAM.
Signed-off-by: Felix Fietkau <nbd@nbd.name>
---
package/base-files/files/etc/init.d/sysctl | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/package/base-files/files/etc/init.d/sysctl b/package/base-files/files/etc/init.d/sysctl
index 2dfbaf7a6e..a0daec071e 100755
--- a/package/base-files/files/etc/init.d/sysctl
+++ b/package/base-files/files/etc/init.d/sysctl
@@ -2,7 +2,23 @@
# Copyright (C) 2006 OpenWrt.org
START=11
+
+set_vm_min_free() {
+ mem="$(grep MemTotal /proc/meminfo | awk '{print $2}')"
+ if [ "$mem" -gt 65536 ]; then # 128M
+ val=16384
+ elif [ "$mem" -gt 32768 ]; then # 64M
+ val=8192
+ elif [ "$mem" -gt 16384 ]; then # 32M
+ val=4096
+ else
+ return
+ fi
+ sysctl -qw vm.min_free_kbytes="$val"
+}
+
start() {
+ set_vm_min_free
for CONF in /etc/sysctl.conf /etc/sysctl.d/*.conf; do
[ -f "$CONF" ] && sysctl -p "$CONF" -e >&-
done
--
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