Michael Steinecke wrote:
currently I'm struggling while creating an application for a custom
STM32F429ZG based custom board using LwIP.
Too sad the F429 discovery board doesn't have an ethernet connector or I
could try to reproduce this :-)
To achieve maximum throughput, I have done some further, potential dangerous
changes:
- The MSS, TCP_SND_BUF, pbuf len, etc is increased from u16_t to u32_t. The
MTU is still 1500. The problem with u16_t is the limitation the send buffer
to a maximum of 0xFFFE bytes. For some checks in LwIP 0xFFFF is interpreted
as 0x0000, but is need to have segments of 0xFFFF bytes for a fast
processing of SD Card pages.
Which version of lwIP are you using? Do you know that we support TCP
window scaling by now (LWIP_WND_SCALE)?
- I decreased the TCP timer intervals from 250 ms to 10 ms. A even higher
rate tends to produce a lot of retransmissions.
You should really not need to do this! I rather expect more problems
than anything being solved. Especially when your main issue is sending
data, not receiving.
I can't help you much on the rest, I'm afraid.
Simon
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