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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
---
deployment/puppet/osnailyfacter/manifests/netconfig/netconfig.pp | 2 +-
tests/noop/spec/hosts/netconfig/netconfig_spec.rb | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/deployment/puppet/osnailyfacter/manifests/netconfig/netconfig.pp b/deployment/puppet/osnailyfacter/manifests/netconfig/netconfig.pp
index 78d5975..42579ac 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 c175aed..80ea0f2 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') }
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