Sending data to offline system doesn't work reliably

Sebastian Sumpf Sebastian.Sumpf at ...1...
Wed Jul 27 11:04:28 CEST 2016

Hi Johanna,

On 07/26/2016 10:58 AM, Johanna Steer wrote:
> Hi,
> i am working on a toolchain monitoring the schedluing behavior of the 
> fiasco.oc kernel. The data is monitored through the trace service (quota 
> for trace is 2M).
> It is then sent to an offline system through an active TCP/IP connection 
> and written into a database. VDE is used for that and i am working on 
> Ubuntu 14.04.
> My problem is that the data isn't sent reliably. I am executing a 
> periodic task that returns zero and exits. The only thing that varies is 
> the period. After 20 seconds the tasks stop, the monitored data is 
> gathered and then sent to the offline system.
> The kernel says that it is sending the data, but the system freezes at 
> times and the data simply doesn't arrive.
> The system reacts quite randomly: Sometimes it sends the files, 
> sometimes it doesn't. Sometimes i get an error (shown below). It seems 
> easier to send small data sizes (around 200KB), above 700KB hardly 
> anything works. In between, it might work or not. As far as i have 
> experienced there is no pattern behind it.
> I tried the tests before with only 1M quota for trace and the 
> reliability improved with 2M quota. However, with 4M it gets worse again 
> and the error occures more often.
> Here ist the error:
> [init -> nic_drv] tx fifo overrun, ignore packet

This error comes from the lan9118 NIC driver. It is a network card
driver we use for the PBXA9 ARM platform in Qemu only. We have never
used it on real hardware, and therefore, it might not work correctly
there. What SoC are you using or do you use Qemu?



> : spawn id exp6 not open
>      while executing
> "expect {
>          -i $running_spawn_id $platform_msg { puts stderr "Error: 
> platform rebooted unexpectedly"; exit -4 }
>          -i $running_spawn_id -re $wait_for_re..."
>      (procedure "wait_for_output" line 22)
>      invoked from within
> "wait_for_output $wait_for_re $timeout_value $qemu_spawn_id"
>      (procedure "run_log" line 28)
>      invoked from within
> "run_log $wait_for_re $timeout_value"
>      (procedure "run_genode_until" line 28)
>      invoked from within
> "run_genode_until forever"
>      (file "/home/johanna/Bachelorarbeit/genode/repos/dom0/run/" 
> line 132)
>      invoked from within
> "source $include_name"
>      ("foreach" body line 6)
>      invoked from within
> "foreach include_name [get_cmd_arg --include ""] {
>      # first check if the include name is absolute
>      if {[string first "/" $include_name] == 0} {
>          puts ..."
>      (file "/home/johanna/Bachelorarbeit/genode/tool/run/run" line 642)
> ------------------------------------------------------------------------------
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