From: Grant Slater <git@firefishy.com>
Date: Sat, 8 Mar 2014 17:37:53 +0000 (+0000)
Subject: tile: Kernel CPU scheduler preempt tuning
X-Git-Url: https://git.openstreetmap.org/chef.git/commitdiff_plain/1e6b35cff075464992deb60c7e4abe4031596bfe?ds=sidebyside

tile: Kernel CPU scheduler preempt tuning
---

diff --git a/roles/tile.rb b/roles/tile.rb
index f24b1ff64..5af10b8b1 100644
--- a/roles/tile.rb
+++ b/roles/tile.rb
@@ -44,6 +44,13 @@ default_attributes(
       :parameters => {
         "net.core.somaxconn" => 10000
       }
+    },
+    :kernel_scheduler_tune => {
+      :comment => "Tune kernel scheduler preempt",
+      :parameters => {
+        "kernel.sched_min_granularity_ns" => 10000000,
+        "kernel.sched_wakeup_granularity_ns" => 15000000
+      }
     }
   },
   :tile => {