This is LPC driver issue ... Vincent
Vincent Cui Firmware Engineer Leader Shanghai Enlogic Electric Technology Co., Ltd. Room1106, Building A, New Caohejing Business Centre, No.391, Guiping Road, Xuhui District, Shanghai, P.R.China T: +86 21 34612525, M: +86 13482482211 www.enlogic.com ------------------------------------------------------------------------ Please consider the environment before printing this email. ------------------------------------------------------------------------ This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to which they are addressed. If you have received this e-mail in error, please notify the sender immediately and then delete it. If you are not the intended recipient, you must not use, disclose or distribute this e-mail without the author's prior permission. We have taken precautions to minimize the risk of transmitting software viruses, but we advise you to carry out your own virus checks on any attachment to this message. We cannot accept liability for any loss or damage caused by software viruses. Any views and/or opinions expressed in this e-mail are of the author only and do not necessarily represent the views of Enlogic. ------------------------------------------------------------------------ -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Slava Zilberfayn Sent: 2014年10月16日 10:34 To: Mailing list for lwIP users Subject: Re: [lwip-users] pbuf_alloc failed after sometime at driver side. 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 lost SZ> for no reason. This can happen even if I connect my PC directly to SZ> the lwip device. SZ> When I look at the WireShark trace, it shows as "TCP Previous SZ> Segment not captured". See attachment. It is certainly not just "not SZ> captured", as this is always accompanied by problems on receiving SZ> end and netconn_write takes longer time to be completed. Eventually SZ> the packets are retransmitted, but it could take like 10 seconds, SZ> which is not very good. SZ> I already instrumented the driver (lpc17_emac), and logs confirm SZ> that all packets are leaving my device strictly in order. What could SZ> be the reason for router to ignore my packets? I also tried with two SZ> different routers and it 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:[email protected] Phone: 416 7289367 Home Electronics, www.home-electro.com 100 Drumlin Circle, Suite 205 Concord, ON, L4K 3E6 CANADA _______________________________________________ lwip-users mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/lwip-users _______________________________________________ lwip-users mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/lwip-users
