This page is dedicated to gathering information about possible performance issues and tweaks for FreeBSD that are posted to this wiki and other sites.
Here are some pages within this wiki with information about improving system performance:
MySQL - tweaks for MySQL
PerformanceTweaks - Simple performance tweaks
PmcTools - entry page for PMC performance measurement tools
WitnessPerformance - a study of impact of WITNESS and INVARIANTS kernel options
netperf - entry page for general network performance related issues, and also for the FreeBSD's network
BenchmarkMatrix - Have a benchmark and results? Add them here.
Please read BenchmarkAdvice before running benchmarks.
Significant past benchmark results
http://people.freebsd.org/~kris/scaling/Scalability%20Update.pdf (describing SMP work for 7.0)
http://people.freebsd.org/~kris/scaling/Filesystem%20Performance.pdf (describing file system work for 6.0)