On Tue, Jun 12, 2007 at 05:49:30PM +0200, J?rgen Lambrecht wrote: > Hello, > > I found out that the maximum IP packet size = 9216 B (0x2400). > I implemented an echo program, both udp and tcp. > My ecos applic can receive more that 9216B, but not send back more than > that. > > Has anybody a clue how to solve this? > I need to support the maximum IP packet size of 65535 B (IP_MAXPACKET).
Interesting. What network technology do you have underneath this. Something reliable i presume since even small packet error rates are going to cause big delay and inefficiencies with retries. > I don't know if this is a bug in ecos, or a (hidden?) limitation of an > embedded OS. I don't know of anybody else using nearly jumbo packets. So you might be running into bugs, or configuration tweaks might be needed. > I'm busy tracing this back in the source > This comes from the socket that is allocated statically in > /io/fileio/.../fd.cxx and socket is part of a cyg_file (cyg_file is > defined by file in file.h). In cyg_file there is a member f_data, which > is the socket. > I'm continuing my search in the code at this point.... Do you get a crash, or does write/sendto return an error code? Andrew -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
