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screaming-pain at libero.it screaming-pain at libero.itThanks Alex, I actually played a bit with the code and found out that exactly half of the times the write() call in the function gsmtap_fd_cb() (gsmtap_util.c) fails because of EAGAIN or EWOULDBLOCK. I implemented a retransmission in this case and this solve the problem: all the gsmtap are successfully sent and received. Though, I suspect is impacting negatively on the rest of the mobile program. Anyway I do not have a real evidence of this only the fact that after the modification I have never had a successful location update. Do you think this is plausible? am I degrading the overall performances when trying to get all the gsmtap? Can i solve this problem? Thanks Alex and list, Loretta >----Messaggio originale---- >Da: vamposdecampos at gmail.com >Data: 6-mag-2011 8.35 >A: "screaming-pain at libero.it"<screaming-pain at libero.it> >Cc: <baseband-devel at lists.osmocom.org> >Ogg: Re: lost dump ?!?!? > >On Thu, May 5, 2011 at 5:28 PM, screaming-pain at libero.it ><screaming-pain at libero.it> wrote: >> Hi list, >> >> I know I am very slow in understanding osmocom-bb, anyway this is just a quick >> question. >> Is it possible that some of the gsmtap messages are getting lost? >> For example I can see a LOCATION UPDATE and a LOCATION ACCEPT from the >> 'mobile' application log but there aren't the corresponding messages in the >> wireshark capture, >> though this does not always happen, I mean I had captures of location updates >> other times, this is why I am wondering if they are getting lost and what it >> does depend on. >> for what I understood the gsmtap functions utilities are in gsmtap_util.c and >> the one to send the messages on the socket is called by l1ctl.c am I right? >> Can you help me understanding why I cannot see all the messages? >> >> thank you in advance >> Loretta > >Hi, > >I've had this happen to me when I wasn't receiving the gsmtap packets. > >Specifically, I had the gsmtap packets sent over the network (i.e., >non-localhost). There was no UDP listener on the receiving end, such >that ICMP port-unreachable replies were being sent back. It would >appear that this causes the sender's kernel to snub some of the >outgoing packets. I don't know if the same happens on localhost. > >If this is your case, you can try "iptables -I INPUT -p udp -d 4729 -j >DROP", or something like "nc -l -u 4729 > /dev/null". > >Cheers, >Alex > >