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The best would be -Os, but still, should be fine... Anyway, I see that You're doing TCP connections, when I remembered, that I've tested UDP streams, when reached ~10Mbps. I'd say that it's just too slow to handle such speeds. What's the Nios CPU frequency and how many MIPS does it show?
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The Nios CPU frequency is 62.5Mhz; for "many MIPS does it show", I don't know where to check it.
I intend to transmit bmp pictures(about 225kb for each picture), I think it will be cut into smaller packets when transmitting through the net wire, so I choose TCP to guarantee the integrity of the data.
By the way, you mentioned "Probably FIFO buffers are filled up...", in my case, do I need a FIFO buffer larger than 225k(currently, my buffer size is 2048 bytes)?
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