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RE: [lwip-users] critical section protection + timer issues

From: Kieran Mansley
Subject: RE: [lwip-users] critical section protection + timer issues
Date: Tue, 22 Feb 2005 10:32:31 +0000

On Mon, 2005-02-21 at 16:32 -0800, Tom C. Barker wrote:
> Could someone give me their advice on the following ftp-data network
> dump.
> (1) I start out with a window of 8096 which decreases by 20 bytes on
> each 
> ACK until lwIP decides to ACK about 7300 bytes. I understand that this
> proper;
> please correct me if I am wrong.
> (2) At this point the snd_win drops to 2186: ( good since 2186 - (8096
> - 7300 ) = 1400 )
> (3) It continues to drop to just under my mss at which point it stays
> at 1450. 
> (4)The transfer is fine up to this point, but then the client begins
> to send data 
> at only 5 second intervals despite immediate lwIP ACKS.
> Any suggestions on how I might be getting the client to avoid
> dropping 
> into this 5 second delay? 
> Any commentary on this whole transaction is greatly appreciated.

I may be missing something, but it's not clear which end (or both) of
the connection is lwIP.  The trace you include is a bit hard to analyse
as well: if no one else is able to solve your problem you could try
posting a tcpdump (perhaps excluding the payloads to avoid making it too
large?) which should be much easier to understand using something like



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