Hello, I'm trying to create TCP/IP application on custom LPC2468 based board which should have fast response time. Tried BSD stack, but found poor performance, so switched to lwip. Until friday I used previous lwip version and all was good except of the fact each IP packet had PUSH flag set which cause some slow down on PC side. At friday I decided to upgrade eCos tree and all the problems came on :)
I replaced lwip_init() with cyg_lwip_sequential_init(), and started thoose IP dealing threads with cyg_lwip_thread_new(). Now I have a problem that lwip sometimes ignores IP frames from PC which cause PC to retransmit frame after two seconds which is not acceptable. This happens not under heavy load. Never saw anything similar on previous lwip version. The response time on ICMP is very good and I don't see any delay or ignorance... Just wondering if anyone saw something similar and have ideas where to dig? Another issue I found, is that lwip sends garbage on Ethernet after it "cannot allocate pbuf to receive packet". I tested it on my custom echo test (but I believe it should be reproducible on default echo test) under the load created from HyperTerminal "send text" function. This should not happen in my app since it is based on request-response protocol with the fairly small packets, but someone may run into this. WBR, Alexander -- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
