Mason <mpeg.b...@free.fr> wrote: > I send 58,400,000 bytes from the PC to the STB. > This takes 14.25 seconds, i.e. an average of 33 Mbit/s > > I was expecting to reach 80+ Mbit/s, so I captured the conversation > with Wireshark, and I noticed that the sender is being throttled > because the receiver (the STB running lwip) is not sending ACKs > fast enough.
From reading the wireshark capture, it seems that the receiver simply is not fast enough. It correctly sends an ACK for every 2nd data packet - no retransmissions involved mean no data dropped. And no data dropped normally means no configuration error in lwIP. It's just processing 2 data packets while in the same time the sender sends three packets. Where does your expectation of 80+ Mbit/s come from? If the hardware is really fast enough, you seem to have a bottleneck somewhere in your code, supposedly either somewhere around your netif driver or in your OS threading? If your netif driver uses PBUF_POOL for rx packets, you might want to check that PBUF_POOL_BUFSIZE is large enough to hold a complete frame. Simon -- NEU: FreePhone - 0ct/min Handyspartarif mit Geld-zurück-Garantie! Jetzt informieren: http://www.gmx.net/de/go/freephone _______________________________________________ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users
