Links to my resources for Linux Performance Tunning. My team need to figure out why a server is slowing down with increase of memory its still the same. We are still in fact finding and getting more information.
http://www.psc.edu/networking/projects/tcptune/
http://fasterdata.es.net/TCP-tuning/linux.html
http://www.csm.ornl.gov/~dunigan/netperf/auto.html
http://patchwork.ozlabs.org/patch/24296/
http://blog.xanda.org/?p=428
http://www.cyberciti.biz/faq/linux-tcp-tuning/