Links to learn on Linux Kernel Network Stack --

http://epickrram.blogspot.in/2016/05/navigating-linux-kernel-network-stack.html
http://lss.fnal.gov/archive/2006/pub/fermilab-pub-06-432-cd.pdf
http://lss.fnal.gov/archive/2006/pub/fermilab-pub-06-432-cd.pdf
http://test-docdb.fnal.gov/0013/001343/001/CHEP06_Talk_132_Wu-Crawford_LinuxNetworking.pdf
https://access.redhat.com/sites/default/files/attachments/20150325_network_performance_tuning.pdf
http://dspace.library.iitb.ac.in/xmlui/bitstream/handle/10054/1645/34859.pdf?sequence=3