Move documentation folder to individual READMEs

plugins/meta/tuning/README.md

@@ -0,0 +1,34 @@
+# tuning plugin
+
+## Overview
+
+This plugin can change some system controls (sysctls) in the network namespace.
+It does not create any network interfaces and therefore does not bring connectivity by itself.
+It is only useful when used in addition to other plugins.
+
+## Operation
+The following network configuration file
+```
+{
+  "name": "mytuning",
+  "type": "tuning",
+  "sysctl": {
+          "net.core.somaxconn": "500"
+  }
+}
+```
+will set /proc/sys/net/core/somaxconn to 500.
+Other sysctls can be modified as long as they belong to the network namespace (`/proc/sys/net/*`).
+
+A successful result would simply be:
+```
+{ }
+```
+
+## Network sysctls documentation
+
+Some network sysctls are documented in the Linux sources:
+
+- [Documentation/sysctl/net.txt](https://www.kernel.org/doc/Documentation/sysctl/net.txt)
+- [Documentation/networking/ip-sysctl.txt](https://www.kernel.org/doc/Documentation/networking/ip-sysctl.txt)
+- [Documentation/networking/](https://www.kernel.org/doc/Documentation/networking/)