Re: [Contiki-developers] Contiki 2.4 release candidate available

[Adam D. <ad...@si...>]

David Kopf wrote:
> Since the Raven webserver rc3 works but not CVS from 2 days later,  it had 
> to be the fragmentation changes that broke it. And using rc3 for the 
> jackdaw, the CVS webserver starts working again if  I set QUEUEBUF_STATS to 
> 0 in queuebuf.c

Ok, great! I just committed a fix to turn it off by default.

> Though the buffers are being allocated OK, on the first fragment 
> queuebuf_new_from_packetbuf was returning a null by way of:
> 
> #if QUEUEBUF_STATS
>       ++queuebuf_len;
>       if(queuebuf_len == queuebuf_max_len + 1) {
>          memb_free(&bufmem, buf);
>          queuebuf_len--;
>          printf("g\n");
>          return NULL;
>       }
> I suppose the Raven (and jackdaw) contiki-conf.h needs some more defines? I 
> will try the jackdaw again after the webserver config is sorted out.

Try adding
#define QUEUEBUF_CONF_NUM 1
#define QUEUEBUF_CONF_REF_NUM 1

to contiki-conf.h

This should also reduce the RAM usage.

/adam

> FYI this has added 2K to the raven webserver RAM requirements.
> 
> ----- Original Message ----- 
> From: "Adam Dunkels" <ad...@si...>
> To: "Contiki developer mailing list" 
> <con...@li...>
> Sent: Sunday, February 07, 2010 1:49 PM
> Subject: Re: [Contiki-developers] Contiki 2.4 release candidate available
> 
> 
>> Hi David,
>>
>> it seems that the bridge is not sending the full number of fragments, or
>> that there is packet loss before the packets are delivered to the
>> sicslowpan layer. The sicslowpan fragment reassembly code is tuned to
>> receive only one fragment at a time, and when a fragment has been
>> received it waits for a specified number of seconds for more fragments.
>> During this time, other fragments are dropped. (That's the "Dropping
>> 6lowpan packet" debug output.) The rationale for this is that fragments
>> are not considered the norm, but an abnormal situation. The network is
>> able to handle them, but it is not optimized for their precence.
>>
> 
> 
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-- 
Adam Dunkels <ad...@si...> | +46 70 7731614 | http://www.sics.se/~adam/
Book: Interconnecting Smart Objects with IP - http://TheNextInternet.org