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TCP receive tested with different IOB_BUFSIZE: | | 256B vs 1534B | 512B vs 1534B | 768B vs 1534B | | :---------: | :-----------: | :-----------: | :-----------: | | Non-SMP | ~85% | ~93% | ~96% | | armv8a-SMP | ~66% | ~84% | ~92% | | rv32/64-SMP | ~52% | ~72% | ~83% | It seems we still get performance penalty on smaller IOBs, and may be affected more under SMP mode. It may be caused by critical sections in IOB operations. Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>