FastDFS性能优化

Question: How to optimize the performance of FastDFS? Test environment: FastDFS version v5.07. There are four machines, A, B, C, and D, where A is the Tracker Server, B, C, and D belong to different groups and are storage servers. The network card is Chelsio Inc T520-CR (10Gbps), the CPU model is Intel Xeon E5-2680, and the operating system is el7.x86_64. FastDFS configuration: Enable small file storage, use polling, and use the default settings for all other necessary configurations. Test results: Single thread is around 5000, and six threads are around 20000. Appendix: 1) Separating data and log directories for storage does not significantly improve performance, and we also modified the configuration items such as accept_threads and work_threads, but we did not find any performance improvement. 2) What is the maximum performance of FastDFS for large-scale small file storage? Have you tested it? Thank you!