Computing Performance Differences Between the REE and TEE

The Kunpeng TrustZone technology uses the time division multiplexing technology to distinguish the CPU operating status. A hardware system is divided into two independent environments: REE and TEE. Theoretically, both REE and TEE are executed in real CPU time slices; therefore, there is no significant difference in performance.

The actual test result is basically the same as the theoretical result.

Environments: The same computing application is deployed in the REE and TEE based on OpenSSL. The single-thread and multi-thread tests are performed using several common algorithms.

Conclusion: The software stacks of the REE and TEE are different but the performance difference is slight.