Re: [lwip-users] Problem of tcp_write with more then about 20 kBytes

[mgroups]

 Hi,

first of all please update to LWIP 1.32. I can only recommend that. 
Second what's your MEM_SIZE, TCP_SND_QUEUELEN, MEMP_NUM_PBUF?
Do you have access to the Debug messages, that could really help.
I think it could be maybe a memory problem.



On Mon, 2 Aug 2010 10:19:06 +0200, Daniel Klingler wrote:
> Hi,
>
> I am using LWIP 1.3 with Xilinx (SDK).
>
> My settings:
> - TCP_SND_BUF 64240
> - TCP_MSS 1460
>
> My problem:
> - If I am do tcp_write with 18720 Bytes the transfer is well going.
> - If I am writing with 19968 Bytes the transfer with some PCs is well going,
> but with other PCs the return of tcp_write is -1.
> - If I am writing with 21504 Bytes or more then with all connected PCs I
> will return -1 of tcp_write.
>
> Does anybody know this issue or has any idea to solve this?
>
> Thanks for your replies.
> Regards,
> Daniel
>
>
>
>
>
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