Starvating threads and SO_REUSEPORT socket

Why tuning If it takes interest and momentum to push a new technology, then what is needed to get this technology go to live production is hard working. Including Cloud Native and Istio. In pre-launch performance testing, Istio out-of-box provided observability, operational convenience, and also introduced pain: Increased service latency. How to minimize latency has become a critical task. My Scenario: SERVICE-A invoke SERVICE-B Latency of Service-A, which was previously 9ms at P50, is now 14ms at P50.