From c5500d5c4506db90268c1d1a1bbbfab8e1109e1e Mon Sep 17 00:00:00 2001
From: Alan Pearce
Date: Thu, 28 Jan 2021 15:53:42 +0100
Subject: bare-metal: add more network optimisations

---
 system/settings/hardware/bare-metal.nix | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

(limited to 'system/settings')

diff --git a/system/settings/hardware/bare-metal.nix b/system/settings/hardware/bare-metal.nix
index 7fd47513..db668830 100644
--- a/system/settings/hardware/bare-metal.nix
+++ b/system/settings/hardware/bare-metal.nix
@@ -18,9 +18,14 @@
     ACTION=="add|change", KERNEL=="sd[a-z]", ATTR{queue/rotational}=="1", ATTR{queue/scheduler}="bfq"
   '';
 
+  boot.kernelModules = [ "tcp_bbr" ];
   boot.kernel.sysctl = {
-    "net.ipv4.tcp_allowed_congestion_control" = "illinois reno lp";
-    "net.ipv4.tcp_congestion_control" = "illinois";
+    "net.core.default_qdisc" = "cake";
+    "net.ipv4.tcp_allowed_congestion_control" = "bbr illinois reno lp";
+    "net.ipv4.tcp_congestion_control" = "bbr";
+    "net.ipv4.tcp_fastopen" = 3;
+    "net.ipv4.tcp_slow_start_after_idle" = 0;
+    "net.ipv4.tcp_mtu_probing" = 1;
   };
 
   zramSwap = {
-- 
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