Benchmarking The Linux Kernel With An "-O3" Optimized Build
Meanwhile for largely user-space contained real-world applications, there wasn't much to report on the -O3 kernel build. Finding any gains from the `-O3 kernel build in real-world, production workloads was difficult even with the diverse range of workloads tested.
The PJSIP communications library supporting a variety of protocols did see some benefits, but again this particular benchmark is rather synthetic.