Re: [lwip-users] crash on a lot of outgoing packets

[Leon Woestenberg]

Hello Kyle,

kyle treleaven wrote:

> Hi all,
>
> I'm using the RAW api, in a Xilinx port of lwip to their ppc405 in
> virtex4 FPGA.  I mimicked the following process for sending out data
> from a basic echo server example (there seems to be a real scarcity of
> raw api examples out there).  The whole thing works ok, but if I start
> trying to send packets faster than they can actually go out, I go into
> an infinite loop of bad pbuf_alloc's. 
Two things here:

1) Infinite? Not good. Your Ethernet outgoing queue should eventually 
free the pbufs that were put on the wire and memory
should be available again.

2) Somewhere you should make a blocking call that waits for your 
Ethernet queue to become non-full again, as lwIP does
not know about this. Typically, you would wait for an interrupt from the 
MAC if you work async, or just block until room
is available in the MAC before you submit the packet to it.

Regards,

Leon.