Increase tcp_retries2 value

Change-Id: I7a01c1b56c3602eb67fc4e1aeaeb1dbd6772841a
Signed-off-by: Michael Polenchuk <mpolenchuk@mirantis.com>

diff --git a/build/f_repos/patch/fuel-library/0003-Increase-tcp_retries2-value.patch b/build/f_repos/patch/fuel-library/0003-Increase-tcp_retries2-value.patch
new file mode 100644 (file)
index 0000000..6e750ae
--- /dev/null
+++ b/build/f_repos/patch/fuel-library/0003-Increase-tcp_retries2-value.patch
@@ -0,0 +1,48 @@
+From 5d4d53082d249e1fadb31fe369f74d25caff700d Mon Sep 17 00:00:00 2001
+From: Alexey Lebedeff <alebedev@mirantis.com>
+Date: Fri, 3 Feb 2017 19:13:14 +0300
+Subject: [PATCH] Increase tcp_retries2 value
+
+Current value of 5 results in socket operation timeout after ~12.9
+seconds. This is a bit too low, e.g. we've seen RabbitMQ network
+splits in production.
+
+This 12.9s amount is equal as 0.2*(2^1+2^2+..2^5), where 0.2 is a
+retry timeout (RTO) that is calculated by kernel on a per-socket
+basis. But in fast local networks it usually almost equal to minimum
+values of 0.2s hardcoded in linux kernel (and BTW, RFC says that
+minimum value should be 1s).
+
+On the other hand, comment in netconfig.pp says that our target
+timeout is ~54 seconds. And changing tcp_retries2 to 7 is consistent
+with that comment - tests an live env show that resulting timeout is
+~52.2s
+
+Change-Id: Ib52f40ef1017a9da5a29cd62fb744a4597860763
+
+diff --git a/deployment/puppet/osnailyfacter/manifests/netconfig/netconfig.pp b/deployment/puppet/osnailyfacter/manifests/netconfig/netconfig.pp
+index 78d59754a..42579ac60 100644
+--- a/deployment/puppet/osnailyfacter/manifests/netconfig/netconfig.pp
++++ b/deployment/puppet/osnailyfacter/manifests/netconfig/netconfig.pp
+@@ -42,7 +42,7 @@ class osnailyfacter::netconfig::netconfig {
+     tcpka_time   => '30',
+     tcpka_probes => '8',
+     tcpka_intvl  => '3',
+-    tcp_retries2 => '5',
++    tcp_retries2 => '7',
+   }
+ 
+   # increase network backlog for performance on fast networks
+diff --git a/tests/noop/spec/hosts/netconfig/netconfig_spec.rb b/tests/noop/spec/hosts/netconfig/netconfig_spec.rb
+index c175aed71..80ea0f242 100644
+--- a/tests/noop/spec/hosts/netconfig/netconfig_spec.rb
++++ b/tests/noop/spec/hosts/netconfig/netconfig_spec.rb
+@@ -27,7 +27,7 @@ describe manifest do
+        'tcpka_time'   => '30',
+        'tcpka_probes' => '8',
+        'tcpka_intvl'  => '3',
+-       'tcp_retries2' => '5',
++       'tcp_retries2' => '7',
+     ) }
+     it { should contain_sysctl__value('net.core.netdev_max_backlog').with('value' => '261144') }
+     it { should contain_class('sysfs') }