Istio Pilot sends all rules to Envoy by default, which may cause performance issues. Here are some solutions to solve this problem:
Use incremental configuration updates: Divide the configuration into multiple parts and update them incrementally instead of transmitting the entire configuration every time. This can reduce network bandwidth and processing load.
Use caching mechanism: Use local cache in Envoy to avoid repeated retrieval of the same configuration information, thus reducing network latency and resource consumption.
Optimize Istio Control Plane: Improve the performance of the control plane by upgrading hardware, strengthening CPU performance, optimizing memory, etc. At the same time, you can also limit the frequency of requests from the control plane to each Envoy instance to reduce load.
Streamline rules and policies: Streamline Istio’s rules and policies as much as possible, such as removing unnecessary rules, merging similar rules, etc. This can reduce the amount of information that Envoy needs to process.
Adjust Envoy parameters: For specific performance issues that occur under certain circumstances, you can adjust relevant parameters in Envoy (such as worker thread count, TCP connection count) to optimize performance.
In summary, solving the issue of Pilot sending all rules to Envoy requires multiple approaches including incremental updates, caching mechanisms, optimizing control plane performance, streamlining rules and policies and adjusting envoy parameters if necessary.




