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2.18.2.2. Data plane performance

Data plane performance depends on many factors, for example:

  • Number of client connections
  • Target request rate
  • Request size and response size
  • Number of proxy worker threads
  • Protocol
  • CPU cores
  • Number and types of proxy filters, specifically telemetry v2 related filters.

The latency, throughput, and the proxies' CPU and memory consumption are measured as a function of these factors.

2.18.2.2.1. CPU and memory consumption
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Since the sidecar proxy performs additional work on the data path, it consumes CPU and memory. As of Istio 1.12.3, a proxy consumes about 0.5 vCPU per 1000 requests per second.

The memory consumption of the proxy depends on the total configuration state the proxy holds. A large number of listeners, clusters, and routes can increase memory usage.

Since the proxy normally does not buffer the data passing through, request rate does not affect the memory consumption.

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