Hello Slava, Hm, the driver was missing error handling, naturally the missing packets returned some error. Looking further...
Regards, Slava Wednesday, October 15, 2014, 3:54:16 PM, you wrote: SZ> Hello, SZ> I'm having some issues with lwip stack, or rather with the system as SZ> whole. At this point I studied the stack relatively well at seems to SZ> work as intended. However I might be still mistaken, so I'm posting SZ> here. SZ> The root of the problems is that sometimes packets are being SZ> lost for no reason. This can happen even if I connect my PC directly SZ> to the lwip device. SZ> When I look at the WireShark trace, it shows as "TCP Previous Segment SZ> not captured". See attachment. It is certainly not just "not captured", as this is SZ> always accompanied by problems on receiving end and netconn_write SZ> takes longer time to be completed. Eventually the packets are SZ> retransmitted, but it could take like 10 seconds, which is not very SZ> good. SZ> I already instrumented the driver (lpc17_emac), and logs confirm that all packets SZ> are leaving my device strictly in order. What could be the reason for SZ> router to ignore my packets? I also tried with two different routers and it SZ> is the same. Could the problem be with MAC-PHY link? SZ> Can anybody suggest further steps for debugging? SZ> Thanks, Slava -- Slava Zilberfayn mailto:szil...@home-electro.com Phone: 416 7289367 Home Electronics, www.home-electro.com 100 Drumlin Circle, Suite 205 Concord, ON, L4K 3E6 CANADA _______________________________________________ lwip-users mailing list lwip-users@nongnu.org https://lists.nongnu.org/mailman/listinfo/lwip-users
