http://www.transnexus.com/White%20Papers/White%20Papers.htm Transnexus sell some commercial product (something like session authorization / CDR device for asterisk) , but they did performance testing for asterisk (back 2 back sip) and SIP switching for Ser
http://www.ffnn.nl/pages/articles/linux/server-wide-performance-benchmarking.php To get a good idea of the relative impact of the chosen filesystem I also tuned the amount of shared buffers used in the PostgreSQL database software, which powers a number of sites on the server. On top of that, I also took a look at the benefit of using
http://lists.freebsd.org/pipermail/freebsd-arch/2007-August/006709.html benchmarking of sysbench in read-write, pgsql vs mysql under FreeBSD
http://www.spec.org/jAppServer2004/results/res2007q3/jAppServer2004-20070606-00065.txt PostgreSQL spec performance test, compared to oracle. With full hardware specs and comments on tuning solaris and postgres