Openmoko Bug #2223: gsm0710muxd loosing packets?

Openmoko Public Trac bugs at
Fri Feb 20 03:54:57 CET 2009

#2223: gsm0710muxd loosing packets?
 Reporter:  kapiteined  |          Owner:  mickey                             
     Type:  defect      |         Status:  assigned                           
 Priority:  high        |      Milestone:  Om2008.12                          
Component:  GSM Modem   |        Version:  unspecified                        
 Severity:  normal      |       Keywords:  gsm 07.10 multiplexer, flow control
 Haspatch:  0           |      Blockedby:                                     
Estimated:              |    Patchreview:                                     
 Blocking:              |   Reproducible:                                     
Changes (by mickey):

  * keywords:  => gsm 07.10 multiplexer, flow control
  * owner:  Nytowl => mickey
  * status:  new => assigned
  * component:  Distro => GSM Modem
  * priority:  normal => high


 I took some time to further analyse the problem. What I suspected was true
 -- the modem can't take the huge frames in multiplexing mode, it's too
 slow to process it. It doesn't happen in single mode since the processing
 load on the modem is less than in multiplexing mode. The good thing though
 is that the modem is actually telling us when it is fed up. The new
 multiplexer fso-abyss clearly shows that it sends us an 'FC' signal, when
 all its buffers are full. The real problem is that we do not honor this
 flag (we should stop sending data in that case until the 'FC' flag has
 been cleared again), but keep flooding the modem with data. This is what
 we have to fix to make it solid.

Ticket URL: <> <>
openmoko trac

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