It only took me 3 -4 weeks to figure this out, but
if you're on a hub, try a switch. Apparently if your micro is in full
duplex mode, a hub is a no-go. I'm using the LM driver and it works
great for receiving lots of data, anyway.
Take a look at the "Identification" field in the IP header for all
packets going one direction. They should be sequential and
incrementing. If there's a gap in the sequence, that means Wireshark
isn't displaying a packet that was sent, either because your hardware or OS
discarded it.
I haven't tried half-duplex yet with the hub again. I'm assuming this
would also fix your problem.
--- On Wed, 8/26/09, Chuck Kuecker <address@hidden>
wrote:
From: Chuck Kuecker <address@hidden>
Subject: RE: [lwip-users] TCP not sending initial ACK
To: "Mailing list for lwIP users" <address@hidden>
Date: Wednesday, August 26, 2009, 11:54 AM
No, the LWIP timers are called from the main timer
tick, and there are
no other threads. This is how LWIP is set up for the Luminary driver
library I am using, and it has always worked before.
Wireshark shows no defective packets.
Chuck
-----Original Message-----
From: lwip-users-bounces+ckuecker=address@hidden
[mailto:lwip-users-bounces+ckuecker=address@hidden]
On
Behalf Of address@hidden
Sent: Wednesday, August 26, 2009 10:34 AM
To: Mailing list for lwIP users
Subject: Re: [lwip-users] TCP not sending initial ACK
Chuck Kuecker wrote:
>
> I've tried changing the frequency of LWIP interrupt handler calls,
> both greatly slowing and speeding them up, with no apparent change in
> behavior.
>
What exactly do you mean with "interrupt handler calls"? The
timers?
They should *not* be called from an interrupt level: the core code of
lwIP may only be accessed from one context at a time!
If you obeyed this rule and still have problems, have a look at
wireshark packet traces and see if it reports errors in a packet. Also,
have a look at the stats (turn them on in lwipopts.h if not already
done) and find out whether there are packets dropped.
Simon
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