RE: [lwip-users] Observations about lwIP on a Xilinx Virtex 4

[Taranowski, Thomas \(SWCOE\)]

3 seconds in ip_input seems really excessive, and points to a race
condition of some sort, in my mind. For example, I'm using at MOST 1.5ms
per received packet, and this includes a bunch of other random
operations at the moment. 

Do you have an idea of what sort of protocol is being received? For
example, are you receiving a UDP datagram, or ICMP packet when it stalls
like this?  It sounds like it could be an issue with having the #defines
in lwipopts.h being set really conservatively, with respect to memory
usage, as it has been in our past releases.

> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden
On
> Behalf Of Roger W. Cover
> Sent: Friday, March 02, 2007 9:38 AM
> To: address@hidden
> Subject: [lwip-users] Observations about lwIP on a Xilinx Virtex 4
> 
> Greetings all,
> 
> I am using the callback (single-threaded) functions in lwIP version
0.6.3
> on
> a Power PC 405 processor in a Xilinx Virtex4FX FPGA. I am using the
built-
> in
> MAC and a 10/100/1000 external PHY. I have noticed some issues with
the
> stack:
> 
> Time to Live is not decremented by lwIP when it echoes an ICMP packet.
> This
> is a minor issue, but I thought the developers should be aware of it.
> 
> err_t ip_input(struct pbuf *p, struct netif *inp) - stays busy for
over 3
> seconds at times. This causes the watchdog timer to reset my system.
In
> order to use lwIP I need to get this resolved. Does anyone have some
> insight
> as to why this might happen?
> 
> In an attempt to use a newer version of lwIP, I downloaded version
1.1.1,
> but the driver (port) I have is not compatible with this version. Is
there
> somewhere I can get guidance to update my port to use the newer
version? I
> think that might help.
> 
> Thank you in advance for your assistance on these matters.
> 
> Regards,
> Roger W. Cover
> Spectral Instruments, Inc.
> 420 N. Bonita Ave.
> Tucson, AZ 85745
> Voice: 520-884-8821 ext. 144
> FAX: 520-884-8803
> 
> 
> 
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