Openmoko Bug #2264: Heavy GPRS traffic causes a Calypso crash

Openmoko Public Trac bugs at
Tue Oct 12 19:37:01 CEST 2010

#2264: Heavy GPRS traffic causes a Calypso crash
    Reporter:  budfive      |        Type:  defect   
      Status:  new          |    Priority:  normal   
   Milestone:               |   Component:  GSM Modem
     Version:  unspecified  |    Severity:  normal   
    Keywords:               |    Haspatch:  0        
   Blockedby:               |   Estimated:           
 Patchreview:               |    Blocking:           
Reproducible:               |  

Comment(by lindi):

 I sent UDP packets at regular intervals and wrote down how it affects the
 calypso system:

 size(bytes) interval(msec) result
 1000 1000 ok
 1000 500 crash
 1000 750 crash
 1000 900 crash
 500 500 ok
 250 250 ok
 130 130 crash

 It seems that we can sustain 1000 bytes per second but trying to go faster
 causes calypso to crash. This probably means that setting "rate" in the
 above tc command to anything higher than say "7kbit" probably allows
 normal users to crash calypso.

 I'm currently testing with

 $ cat /etc/ppp/ip-up.d/09lindi-tc
 /sbin/tc qdisc add dev ppp0 root tbf rate 7kbit latency 4500ms burst 3200

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