[lwip-users] RE: [lwip] TCP xfer halting

[Kevin Stokes]

  My thanks to all who replied to my question about the stack halting during
large transfers.  Putting in those fixes repaired the problem, and LWIP is
running very well now.

-Kevin Stokes


-----Original Message-----
From: address@hidden [mailto:address@hidden Behalf Of Kieran
Mansley
Sent: Thursday, October 31, 2002 5:22 PM
To: address@hidden
Subject: Re: [lwip] TCP xfer halting


On Thu, 31 Oct 2002, Kevin Stokes wrote:
>
>   It is just sitting there with tcp_sndbuf() always returning a value of 0
> bytes, so no more data gets sent to tcp_write().

It could be the problem/fix I put in last week for the congestion window
variable wrapping to zero.  That would require a large number of transfers
before it was visible, and would often happen at around the same point.
Try turning on the CWND debug flag and see if it suddenly jumps from a
large value to zero or near zero just before the problem occurs.

Kieran

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