From e51046aae2217f70b2e628159f832e993c6afcf7 Mon Sep 17 00:00:00 2001
From: Grant Slater <git@firefishy.com>
Date: Wed, 9 Jun 2021 18:24:48 +0100
Subject: [PATCH] tile: Enable TCP BBR again experimentally. Uplinks not
 congested

---
 roles/tile.rb | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/roles/tile.rb b/roles/tile.rb
index dbc2d5fd8..82dcc21ba 100644
--- a/roles/tile.rb
+++ b/roles/tile.rb
@@ -68,7 +68,20 @@ default_attributes(
         "kernel.sched_min_granularity_ns" => 10000000,
         "kernel.sched_wakeup_granularity_ns" => 15000000
       }
-    }
+    },
+    :no_tcp_slow_start => {
+      :comment => "Disable TCP slow start",
+      :parameters => {
+        "net.ipv4.tcp_slow_start_after_idle" => "0"
+      }
+    },
+    :tcp_use_bbr => {
+      :comment => "Use TCP BBR Congestion Control",
+      :parameters => {
+        "net.core.default_qdisc" => "fq",
+        "net.ipv4.tcp_congestion_control" => "bbr"
+      }
+    },
   },
   :tile => {
     :database => {
-- 
2.45.1