From: Grant Slater <git@firefishy.com>
Date: Fri, 21 Feb 2014 14:56:59 +0000 (+0000)
Subject: nominatim: chef up kernel scheduler tuning
X-Git-Url: https://git.openstreetmap.org/chef.git/commitdiff_plain/d3020dfb2e4892dd734b2061dbd0c46675d3ba39

nominatim: chef up kernel scheduler tuning
---

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 => {