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lwip ping slow in debug mode

Question asked by mei.raymond on Feb 26, 2015
Latest reply on Feb 27, 2015 by mei.raymond
I use cube1.3.0 lwip on STM429. It can work and ping ok in release mode.
But in debug mode when I use keil and st-link, it always timeout. I have tried ping and TCP recv/send, it's response 2-3 seconds.
Link below say ST demo code has a bug, and should drain the hardware FIFO on each interrupt:
http://lists.gnu.org/archive/html/lwip-users/2012-11/msg00013.html
Is it true? How can I clear FIFO ?
Thanks in advance.

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