links
https://blog.packagecloud.io/eng/2016/06/22/monitoring-tuning-linux-networking-stack-receiving-data/#special-thanks
https://habrahabr.ru/post/265061/
http://www.javaworld.com/article/2076555/build-ci-sdlc/java-performance-programming--part-2--the-cost-of-casting.html
https://habrahabr.ru/company/odnoklassniki/blog/266005/