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How to increase the TMS320C6455 Giga Ethernet's throughput?

Dear all, I encounter a probelm of 6455's Giga Ethernet these days. When I test the Giga Ethernet 's thoughput  between the DSP  and a PC,I find  that  if the DSP's  core clock frequency is 1GHz,   the maximum throughput is only 520Mbits/s, if the  DSP's core clock frequency is 1.2GHz, the maximum throughput is only 680Mbits/s. Does the DSP's clock frequency limit the performance of the Giga Ethernet? Can we increase the throughput? NDK V1.94 AND tcp/ip socket are used.