From d3020dfb2e4892dd734b2061dbd0c46675d3ba39 Mon Sep 17 00:00:00 2001
From: Grant Slater <git@firefishy.com>
Date: Fri, 21 Feb 2014 14:56:59 +0000
Subject: [PATCH] nominatim: chef up kernel scheduler tuning

---
 roles/nominatim.rb | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/roles/nominatim.rb b/roles/nominatim.rb
index 4e85a77ef..8e3ed5d0b 100644
--- a/roles/nominatim.rb
+++ b/roles/nominatim.rb
@@ -45,6 +45,13 @@ default_attributes(
         "kernel.shmmax" => 26 * 1024 * 1024 * 1024,
         "kernel.shmall" => 26 * 1024 * 1024 * 1024 / 4096
       }
+    },
+    :kernel_scheduler_tune => {
+      :comment => "Tune kernel scheduler preempt",
+      :parameters => {
+        "kernel.sched_min_granularity_ns" => 10000000,
+        "kernel.sched_wakeup_granularity_ns" => 15000000
+      }
     }
   },
   :nominatim => {
-- 
2.43.2