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When evaluating the performance of the LWIP and DJYIP protocol stacks on STM32F7, it is important to understand the differences in TCP packet reception speeds under various conditions. This testing was conducted to ensure consistent hardware and software configurations while assessing the efficiency of the protocol stacks. The following analysis outlines the testing methodology, setup, and results.
The primary goal of this testing was to compare the TCP packet reception speeds of the LWIP and DJYIP protocol stacks under identical hardware and software conditions. By maintaining consistency in both hardware platforms and software configurations, we aimed to isolate any differences in performance that could be attributed to the protocol stacks themselves.
The testing was conducted using an STM32F7 development board with the following specifications:
The software configuration for both protocol stacks included:
The testing process involved:
lwipopts.h to optimize for high-throughput performance.The test results revealed significant differences between the two protocol stacks, particularly in terms of TCP reception performance:
| Data Package Size (Bytes) | LWIP Reception Speed (Mbps) | DJYIP Reception Speed (Mbps) |
|---|---|---|
| 1400 | 3.02 | 3.18 |
| 1024 | 4.22 | 3.16 |
| 512 | 3.07 | 3.16 |
| 256 | 2.02 | 2.5 |
| 128 | 0.2±0.2 | 1.76 |
| 64 | 0.2±0.2 | 1.12 |
| Random (0-1460) | 1M (within variation) | 2.52 |
These results indicate that the LWIP protocol stack generally outperformed the DJYIP stack, particularly for packet sizes of 1024 bytes and larger. It is worth noting that the performance difference for 1024-byte packets might be due to the way LWIP handles packets of sizes that are powers of two, which could be a coincidence or a reflection of underlying characteristics of the protocol stack.
The findings suggest that the choice of protocol stack can significantly impact TCP performance, especially under varying packet size conditions. While LWIP demonstrated slightly better performance for larger packets, it is crucial to consider the specific requirements of the application when selecting a protocol stack. DJYIP, while slightly less efficient for larger packets, might provide more predictable or consistent performance in certain scenarios.
Future testing could explore additional factors such as packet fragmentation, lower-layer driver optimizations, and network hardware configurations to further refine the performance characteristics of these protocol stacks.
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