RE: [lwip-users] TCP payload is doubled

[David Shmelzer]

Thanks Jan. 

I tried setting TCP_WND_UPDATE_THRESHOLD to 0 and I still get the same 
behaviour of decreasing window size.
I then reverted to 1.3.0 and the window size stays constant as expected.
I would stay at 1.3.0 if I could but I need a fix that 1.3.1 has.
Any help would be greatly appreciated.

Thanks,
Dave


-----Original Message-----
From: address@hidden [mailto:address@hidden On Behalf Of Jan Wester
Sent: Friday, October 16, 2009 7:42 AM
To: 'Mailing list for lwIP users'
Subject: SV: [lwip-users] TCP payload is doubled

Hi
I have the same problem
Kieran mention about to set TCP_WND_UPDATE_THRESHOLD = 0. I have not tested 
yet, will start to test next week

Kieran wrote
The window advertisement code was re-worked in 1.3.1 to only send an explicit 
update when the change in window is greater than TCP_WND_UPDATE_THRESHOLD.  
This defaults to (TCP_WND / 4). You could define this to be zero to get the old 
behaviour, but the new behaviour should be much better.  I would be interested 
to know what the problem you encounter as a result of the less-frequent window 
updates is.  Note that any ACKs for data that get returned should have the 
up-to-date window information in them
- it is only the sending of explicit window update ACKs that is restricted.

/Jan


-----Ursprungligt meddelande-----
Från: address@hidden
[mailto:address@hidden För David Shmelzer
Skickat: den 15 oktober 2009 21:56
Till: Mailing list for lwIP users
Ämne: RE: [lwip-users] TCP payload is doubled

I did a wireshark capture and the window size from lwip keeps decreasing by the 
packet length received by lwip for each transaction. When it finally decreases 
to less than the packet size my s/w hiccups because it expects a full packet. 
So this problem exposed a flaw in my software. Is anyone else seeing teh window 
size decreasing?


-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of Bill Auerbach
Sent: Wednesday, October 14, 2009 8:13 AM
To: 'Mailing list for lwIP users'
Subject: RE: [lwip-users] TCP payload is doubled

>Occasionally, the payload in my TCP return packet sent from lwip is 
>more bytes than I'm expecting.
>It looks like it may be concatenating two copies of the payload.

Does this mean the data received by the application is bad or you're just 
receiving more of it than you expected but it's all good?

Bill



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