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Altera_Forum
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16 years ago

Why I have to increase MAXBIGPKTS to make the UDP transfer

Hello everyone, I am now doing a data transfer work based on StratixII NiosII development kit RoHS board. It is a very simple one which read data from a FIFO outside NiosII core. The data are ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Hi Daixiwen,

Actually I have tried to use TSE daughter board along with this development kit. I met the same problem. It is very strange that the accelerated design from Altera works well so I think there must be something wrong in my design.

I also tried to use onchip memory but got no luck. I guess that I send the socket packets to the Ethernet port too fast. The Ethernet port cannot empty the buffer in time if the allowed buffer number size (MAXBIGPKTS) is a small value. Is there a way that I can improve that? I saw a lot of people can achieve above 50Mbits/s speed without change anything related to the default buffer value.

Thanks for you help.

Xishan