From: Grant Slater <git@firefishy.com>
Date: Sat, 8 Feb 2014 07:31:58 +0000 (+0000)
Subject: jakelong, nepomuk: Decrease scheduler queue depth to improve latency
X-Git-Url: https://git.openstreetmap.org./chef.git/commitdiff_plain/8e3e7264d0bba3adc61ca88c33d636b0a7605da7

jakelong, nepomuk: Decrease scheduler queue depth to improve latency
---

diff --git a/roles/jakelong.rb b/roles/jakelong.rb
index 41b409f5d..5338778e0 100644
--- a/roles/jakelong.rb
+++ b/roles/jakelong.rb
@@ -26,6 +26,15 @@ default_attributes(
     :cache_mem => "650 MB",
     :cache_dir => "coss /store/squid/coss-01 15000 block-size=8192 max-size=262144 membufs=30"
   },
+  :sysfs => {
+    :hdd_tune => {
+      :comment => "Tune the queue for improved performance",
+      :parameters => {
+        "block/xvda/queue/nr_requests" => "64",
+        "block/xvda/queue/scheduler" => "deadline"
+      }
+    }
+  },
   :tilecache => {
     :tile_parent => "sanfrancisco.render.openstreetmap.org",
     :tile_siblings => [
diff --git a/roles/nepomuk.rb b/roles/nepomuk.rb
index 8d64f6ac3..3c7d3ccf9 100644
--- a/roles/nepomuk.rb
+++ b/roles/nepomuk.rb
@@ -30,8 +30,8 @@ default_attributes(
     :hdd_tune => {
       :comment => "Tune the queue for improved performance",
       :parameters => {
-        "block/vda/queue/nr_requests" => "512",
-	"block/vda/queue/scheduler" => "noop"
+        "block/vda/queue/nr_requests" => "64",
+        "block/vda/queue/scheduler" => "deadline"
       }
     }
   },