RE: [ECOS] network problem

[John Mills <johnmills@speakeasy.net>]

Rick -

You could try drastically reducing the capacity of the pool you think
you're depleting. That way you might generate the lockup in a few minutes
or an hour, instead of 12 hours.

 - John Mills

On Tue, 28 Aug 2007, John Mills wrote:

> Rick -
> 
> I have just run to ground a problem with very similar symptoms. It turned
> out that the 'socket' pool ("zone") was depleted by unrecoverable, stale
> TCP connection records. I tracked this down by adding a counter for
> allocated/ deallocated data structures from that pool and diagnostic
> printouts of the count as sockets were allocated or freed. Though we
> noticed the problem with web inquiries, it turned out to have other
> effects - like your inability to open a 'telnet' connection.
> 
> As I understand eCos 'zones', each is initially allocated a fixed memory
> block based on the size of a specific data structure and the number of
> such structures they are expected to provide. Thus a simple counter will
> reflect where you stand with respect to a particular pool's capacity and
> you probably don't have to dig into the zone alloc/dealloc mechanism.
> 
> HTH.
> 
>  - John Mills 
> 
> DISCLAIMER: I'm a relative beginner with eCos.
> 
> On Tue, 28 Aug 2007, Rick Davis wrote:
> 
> > Andrew,
> > 
> > After I sent the e-mail this morning, it stopped working in another way.
> > http stopped responding but pings still worked. I have a simple telnet
> > server on my application and it was failing trying to bind with "Try again
> > later". In_pcbbind was failing because in_pcbinshash was failing indicating
> > it couldn't MALLOC memory. I turned on fancy asserts and tracing and am
> > testing again. It usually take 12 Hrs or more to fail. In_pcbhash MALLOCs
> > from the network pool so I am monitoring that. Any ideas why the network
> > pool would run out of memory? Can it get fragmented?
> > 
> > Thanks,
> > Rick Davis
> 
> 

-- 
 - John Mills
   john.m.mills@alum.mit.edu


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