lwip-users-request,您好！
>Message: 1 >Date: Fri, 16 Jun 2006 15:15:35 +0300 >From: Pavel Grishin <[EMAIL PROTECTED]> >Subject: [lwip-users] TCP transmission stalls >To: Mailing list for lwIP users <[email protected]> >Message-ID: <[EMAIL PROTECTED]> >Content-Type: text/plain; charset=us-ascii > >Hello, > >I am running a test program which sends some text continuously. > >while(1){ > do{ > while(tcp_sndbuf(serv_pcb) < strlen(text)); > err = tcp_write(serv_pcb, text, strlen(text), 0); > tcp_output(serv_pcb); > }while(err != ERR_OK); >} > >It transmits a number of times and then stops with err = ERR_MEM. >Why does it happen? > >I am using lwIP with VDK and blackfin. > >Pavel. > I had ever engage a error some how like your situation. My problem is cased by the options in opt.h. The one who port lwip to ucos set the PBUF_LINK_HLEN to 14. As the 2byte alinement of the package, and 4byte alinement of ARM code, lwip would wipe the mem_free pointer when it write the link header. So the package pbuf will never be free, after a few package sent out ,the memory is use up. I set PBUF_LINK_HLEN to 16 and the problem disappear! Whould this be your question too? (sorry ,my english is poor ,hope that you can understand what I am talking) = = = = = = = = = = = = = = = = = = = = 致 礼！ 铁石 [EMAIL PROTECTED] 2006-06-17
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