[mc1322x] Fragmented packets: could not allocate a queuebuf

[Jon Smirl]

On Wed, Jul 21, 2010 at 8:00 AM, Mariano Alvira <mar at devl.org> wrote:
> On Wed, Jul 21, 2010 at 12:08:24AM +0200, Daniel Berenguer wrote:
>> Following my tests about sending fragmented UDP packets...
>>
>> Receiving multiple data packets of 512 bytes seems to cause the
>> following Contiki run-time error:
>> queuebuf_new_from_packetbuf: could not allocate a queuebuf
>>
>> The first receptions work just fine - hence my initial happiness :-) -
>> but later transmissions end by encountering the above error. I've

That's smells like buffers are being lost from the queue. A small race
condition somewhere where a buffer getting freed gets lost instead of
being returned to the queue. Over time buffers get lost until you
start running out of them.


>> tested with smaller packets and I'm not able to reproduce the problem.
>> Maybe 1300 bytes is too much for a single packet ??
>>
>> I'm now trying to know whether this problem could be due to some kind
>> of "time" overlap between incoming packets...
>
> Could you try increasing the number of QUEUEBUFs? In platform/redbee-econotag/contiki-conf.h:
>
> #define QUEUEBUF_CONF_NUM          16
>
> Maybe increase this to 32?
>
> -Mar.
>
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-- 
Jon Smirl
jonsmirl at gmail.com