[LITMUS^RT] high miss ratio for low task utilization

[Björn Brandenburg]

> On 21.11.2014, at 17:31, jp walters <mailinglistjp39 at gmail.com> wrote:
> 
> It looks like our emails crossed.
> 

Sorry, I'm on the phone atm with spotty reception... it's hard to debug traces on 4in. ;-)


>> Make sure you give the tool all
>> per-CPU files together to analyze the complete trace. The data below looks like per-CPU data (huge gaps in the job sequence numbers).
> 
> Okay, that was my first issue.  Redoing this using all of the per-CPU files I also see no tardiness or deadline misses, but I also don't get any of the names, periods, or costs:
> 
> root at ubuntu-qemu:~/simple# grep "NAME=" trace_output
> # task NAME=<unknown> PID=3974 COST=0 PERIOD=0 CPU=-1
> # task NAME=<unknown> PID=3973 COST=0 PERIOD=0 CPU=-1
> # task NAME=<unknown> PID=3972 COST=0 PERIOD=0 CPU=-1

Does this still happen if you launch st_trace before starting RT tasks?

Thanks,
Björn 


> 
> 
> 
>  
>>> # Task,   Job,     Period,   Response, DL Miss?,   Lateness,  Tardiness
>>> # task NAME=<unknown> PID=3802 COST=0 PERIOD=0 CPU=-1
>>>   3802,     9,          0,   30657540,        0,  -29342460,          0
>>>   3802,    13,          0,   32616504,        0,  -27383496,          0
>>>   3802,    39,          0,   30793032,        0,  -29206968,          0
>>>   3802,    89,          0,   29259038,        0,  -30740962,          0
>>>   3802,    93,          0,   29860287,        0,  -30139713,          0
>>>   3802,    97,          0,   29485435,        0,  -30514565,          0
>>>   3802,   101,          0,   30333923,        0,  -29666077,          0
>>>   3802,   131,          0,   30122722,        0,  -29877278,          0
>>>   3802,   135,          0,   30649661,        0,  -29350339,          0
>>> # task NAME=<unknown> PID=3801 COST=0 PERIOD=0 CPU=-1
>> 
>> This looks totally ok. All jobs in this trace have zero tardiness / negative lateness and met their deadlines. I don't see a problem here. 
>> 
>> - Björn 
>> 
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> 
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