Few config suggestions - http://blog.monitis.com/index.php/2011/05/11/20-linux-server-performance-tips-part-2/

Linux kernel profiling with perf  - https://perf.wiki.kernel.org/index.php/Tutorial http://lxr.free-electrons.com/source/tools/perf/design.txt

Intel VTune Amplifier profiler - http://software.intel.com/en-us/intel-vtune-amplifier-xe

Oracle solaris studio - http://www.oracle.com/technetwork/server-storage/solarisstudio/overview/index.html

http://www.brendangregg.com/linuxperf.html <- "This page links to various Linux performance material I've created, including the tools maps on the right."

Simple config to kernel can get meaningful performance improvement, if needed - https://blog.acolyer.org/2019/11/04/an-analysis-of-performance-evolution-of-linuxs-core-operations/