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Re: [lwip-users] Connections slowing down after some time
From: |
Steffen Wolfer |
Subject: |
Re: [lwip-users] Connections slowing down after some time |
Date: |
Mon, 09 Mar 2009 11:15:17 +0100 |
On Fri, 2009-03-06 at 14:21 +0000, Kieran Mansley wrote:
> Looking at the traces there are two problems:
>
> 1) Sometimes a SYN needs to be retransmitted
> 2) Sometimes data segments are retransmitted only after a very large
> gap
>
> (...)
>
> The second is rather odd as the time to wait before retransmitting is
> down to the other end. As an example see frame 60 in the
> slow_reply.pcap trace. This is a retransmission of frame 59, but it
> waited 6 seconds, which is an unusually long time and isn't really the
> fault of lwIP. I'd expect it to wait around 200ms. Are you running a
> normal TCP/IP stack on the other end?
The other end is a desktop computer running Linux (Ubuntu 8.10). Between
the microcontroller board and the desktop pc is a switch.
Seems like I have to find out why Linux waits such a long time until the
packet.
Steffen