How to Profile eBPF Code and Measure Performance Overhead
How Do I Profile eBPF Code?
I demonstrate a practical method for measuring the performance impact of eBPF workloads using a custom C test harness and the perf tool. By pinning execution to a specific CPU and analyzing kernel cycles, we can isolate bottlenecks in file open operations. This approach allows us to pinpoint exactly where optimizations are needed in the eBPF code path.
This turned out to be in a hot path, which meant every allocation-to-CPU cycle shaving will make a significant impact on the performance of the system.