Re: [lwip-users] problems with LWIP on Xilinx ML403

[Siva Velusamy]

On 10/2/07, Kieran Mansley <address@hidden> wrote:

On Mon, 2007-10-01 at 12:46 -0700, Mike Caplinger wrote:
> I've been trying to do large bulk data transfers using the sockets API
> on an ML403 board using the version of LWIP bundled with EDK 8.2i.  I
> won't bore you with all the total stalls of LWIP I've experienced, but I
> have noticed that there seems to be a huge bug in the Xilinx
> implementation of sys_arch.  The function sys_arch_sem_wait is supposed
> to return the amount of time it had to wait to get the semaphore, or
> SYS_ARCH_TIMEOUT if it failed to get it.  But the v2pro port version in
> EDK 8.2i simply returns the timeout immediately if it got the semaphore,
> regardless how long it had to wait, if at all.  This causes the TCP
> thread, which is using a 250 msec timeout handler to call tcp_tmr,  to
> go completely nuts during a transfer, since tcp_tmr ends up getting
> called at extremely high rates.  Retransmits and timeouts happen too
> fast, RTO is completely misestimated (I've seen it stuck up at 32767) etc.

As this is a bug in a port rather than lwIP itself I think you'll have
to contact whoever distributes your EDK 8.2i and ask them to fix it.
This is code that is beyond our control.

Thanks

Kieran

That is correct. This is a bug, and is fixed in EDK 
9.2.

-Siva