From e387bbedabe15b79bc1770a804980f229fef80b9 Mon Sep 17 00:00:00 2001
From: "Ycarus (Yannick Chabanois)" <ycarus@zugaina.org>
Date: Thu, 1 Aug 2024 12:01:05 +0200
Subject: [PATCH] Tune kernel settings

---
 .../files/etc/sysctl.d/openmptcprouter.conf    | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/openmptcprouter/files/etc/sysctl.d/openmptcprouter.conf b/openmptcprouter/files/etc/sysctl.d/openmptcprouter.conf
index 47cbcda11..c7ee838e0 100644
--- a/openmptcprouter/files/etc/sysctl.d/openmptcprouter.conf
+++ b/openmptcprouter/files/etc/sysctl.d/openmptcprouter.conf
@@ -2,14 +2,14 @@
 # max open files
 fs.file-max = 512000
 # max read buffer
-net.core.rmem_max = 16777216
+net.core.rmem_max = 7500000
 # max write buffer
-net.core.wmem_max = 16777216
+net.core.wmem_max = 7500000
 #net.core.optmem_max = 33554432
 # default read buffer
-net.core.rmem_default = 16777216
+#net.core.rmem_default = 16777216
 # default write buffer
-net.core.wmem_default = 16777216
+#net.core.wmem_default = 16777216
 # max processor input queue
 net.core.netdev_max_backlog = 8192
 # max backlog
@@ -24,13 +24,13 @@ net.ipv4.tcp_tw_reuse = 1
 # short FIN timeout
 #net.ipv4.tcp_fin_timeout = 40
 # increase max orphans
-net.ipv4.tcp_max_orphans = 32768
+net.ipv4.tcp_max_orphans = 16384
 # short keepalive time
 #net.ipv4.tcp_keepalive_time = 2400
 # outbound port range
 net.ipv4.ip_local_port_range = 9999 65000
 # max SYN backlog
-net.ipv4.tcp_max_syn_backlog = 10240
+net.ipv4.tcp_max_syn_backlog = 4096
 # max timewait sockets held by system simultaneously
 net.ipv4.tcp_max_tw_buckets = 6000
 # turn on TCP Fast Open on both client and server side
@@ -40,11 +40,15 @@ net.ipv4.tcp_rmem = 4096 87380 16777216
 # TCP write buffer
 net.ipv4.tcp_wmem = 4096 87380 16777216
 # TCP buffer
-net.ipv4.tcp_mem = 1638400 1638400 1638400
+net.ipv4.tcp_mem = 409600 819200 1638400
 # UDP buffer
 net.ipv4.udp_mem = 4096 131072 67108864
 # turn off path MTU discovery
 net.ipv4.tcp_mtu_probing = 0
+# 1/8 * available memory in receive buffer
+net.ipv4.tcp_adv_win_scale=-3
+# limits the size of unsent bytes in the write queue
+net.ipv4.tcp_notsent_lowat = 131072
 
 # for low-latency network, use cubic instead
 # net.ipv4.tcp_congestion_control = balia