Re: [lwip-users] Problem with sending big buffers tolwip_writeandsemaphoresduring big downloads.

[Hans . Forsstrom]

Hello,
I'm not able to see anything more on
wireshark running on my laptop, and I'm not able to run any tools on our
target platform.

Yes, it looks like a deadlock problem.
I haven't figured out why I only get it for data sizes over one TCP frame
size though.

For the moment I will have to leave
this, but I will try to do some more debugging later on. I'll try to use
our "consol" for the LWIP_DEBUG printouts, but it has some limitations.

/Hans

Kieran Mansley <address@hidden>
Sent by: address@hidden

2007-04-11 16:26

Please respond to
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Subject	Re: [lwip-users] Problem with sending big buffers         tolwip_writeandsemaphoresduring big downloads.

On Wed, 2007-04-11 at 15:42 +0200, address@hidden
wrote:
> 
> Sorry, I took the wrong file. This should work. 
> 

That does indeed look odd.  There are no further packets sent/received
on the connection after this point?

It looks like you've got some deadlocking issue perhaps, where the
second lwip_send call is sitting blocked trying to get a lock of some
kind (although lwip infamously has very few locks!) which isn't being
released by another thread.

I'm afraid that you'll have to do some debugging.  If you can find
out
where the blocked lwip_send call is waiting, that would probably help,
and try running the LWIP_DEBUG stuff on to get some more information
about what's going on.

Kieran



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