Re: [lwip-users] How to force dup ACK

[yueyue papa]

Kieran,

thank you to review.



On Thu, Apr 15, 2010 at 5:44 PM, Kieran Mansley <address@hidden> wrote:
> On Thu, 2010-04-15 at 15:32 +0800, yueyue papa wrote:
>> Hi All,
>>
>> I use lwIP in GPRS environment.  Wireshark is setup in the server.  I
>> find these information:
>>
>> lwip  device  <--------------------> server (Wireshark running there)
>>
>> if  TSS = 512, the TCP stream is working very stable.
>>
>> if TSS = 1024, 1460, there is always TCP ACK lost in server. The
>> resend is always happen.
>>
>> The resend cause the performance down.
>
> Are you sure it is ACKs that are being lost rather than packets with
> payload?  Could you post an example wireshark capture to show this?
>
>> Is there a solution I could configure lwIP make duplicate ACK send, so
>> as to decrease the ACK lost possibility?
>
> Not that I know of.
>
> Kieran
>
>
>
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