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[lwip-users] Abnormal Tx delays

From: Nicolas Pinault
Subject: [lwip-users] Abnormal Tx delays
Date: Tue, 18 Sep 2007 17:34:28 +0200
User-agent: Thunderbird (Windows/20070728)

Hi all,

I have a problem with my system.
I use lwip CVS HEAD (got it today).
I use µC/OS-II.
I use ethernet chip KSZ8841 (8 bit mode).
I use tcpip_input to input frame into lwip.
I use several tasks to send/receive data thru lwip.
One of these tasks is a basic WEB server.

At startup, pinging my system (from a WinXP PC) is ok.
Then I use FireFox to browse the WEB of my system.
I refresh several times.
After a random number of refresh, lwip still responds to input packets but with big delays. Even pinging my system with a quiet traffic is not ok. Answers come several seconds (several tens of seconds) after the incoming packets. See the WireShark capture (a filter has been used to capture only interresting packets). Looking at lwip traces, it seems that incoming packets are stored but not treated immediately. After a random delay, they are treated and response packet are sent.

I can't figure out where the problem is.

Any help is welcome.


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