Hi,
I am using lwip with NO_SYS=1, and I have noticed
that outgoing TCP packets are very delayed.
It looks like between writing a packet (using tcp_write),
and the time it actually written to the interface it takes usually about 200ms.
I examined the code, and it looks like lwip only writes regular packets every 500ms.
Basically tcp_write only adds segments to a list, and they are only actually sent inside tcp_slowtmr.
Which, by default, is only called once every two calls to tcp_tmr().
Which gets called every 250ms, so the data being written with tcp_write will be sent out up to 500ms later.
This is a really, really long time!
Am I missing something?
Thanks!