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<p class="MsoNormal">Dear,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB">I’m using Litmus-RT for my PhD project to test the schedulability of real-time tasks.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I use <i>base</i>_<i>task</i> as starting point to create real-time tasks and the execution time approaches the wanted execution time.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Now I’m testing at which task-set utilization deadline misses start to occur. To trace this I use Feather Trace.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">As long as I don’t have any deadline misses I can trace every job of each task perfectly. But if I have deadline misses the traces shows a gap (output0: line 2571-2620) where only the release events are recorded (no completion,
switch_to and swtich_away events). For each task a couple jobs has no tracing information, and this increase if the utilization increases.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">I attached the .bin file, and the converted files to human readable format.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">My question is if this the normal behaviour of feather trace/litmus-rt. Because I aspect to have deadline misses at this utilization, but I need to know at what exact moment the deadline misses happen.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Set-up: Intel(R) Xeon(R) CPU E5-2420 v2 @ 2.20GHz, RT-XEN, VM with 1 VCPU which can use 1 CPU 100% (budget == period), scheduler: GSN-EDF<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">TaskSet utilization: ~94-95 % (measured execution time of all jobs/(time of latest completion – time of first release)).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB">Thanks in advance. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="color:black;mso-fareast-language:NL-BE">Ing. Yorick De Bock<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-GB" style="color:black;mso-fareast-language:NL-BE">PhD Student<br>
<br>
<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;color:black;mso-fareast-language:NL-BE">IDLab - University of Antwerp - IMEC<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;color:black;mso-fareast-language:NL-BE">Faculty of Applied Engineering<br>
</span><span lang="EN-GB" style="font-size:10.0pt;color:#1F252A;mso-fareast-language:NL-BE">Ca</span><span style="font-size:10.0pt;color:#1F252A;mso-fareast-language:NL-BE">mpus Groenenborger - Room CGB.V.330<br>
Groenenborgerlaan 171 - 2020 Antwerpen – Belgium<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#1F252A;mso-fareast-language:NL-BE">T: +32 3 265 18 87
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;color:#1F252A;mso-fareast-language:NL-BE">M:
</span><span style="font-size:10.0pt;color:#1F497D;mso-fareast-language:NL-BE">+32 4 79 83 38 87<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:NL-BE"><a href="http://www.imec.be"><span style="font-size:10.0pt;color:#1F4E79">www.imec.be</span></a></span><span style="font-size:10.0pt;color:#1F4E79;mso-fareast-language:NL-BE">
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</span><span style="mso-fareast-language:NL-BE"><a href="http://www.idlab.uantwerpen.be/"><span style="font-size:10.0pt;color:#1F4E79">idlab.uantwerpen.be</span></a></span><span style="font-size:10.0pt;color:#1F4E79;mso-fareast-language:NL-BE">
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</span><span style="mso-fareast-language:NL-BE"><a href="http://www.idlab.technology/"><span style="font-size:10.0pt;color:#1F4E79">idlab.technology</span></a></span><span style="font-size:10.0pt;color:#1F4E79;mso-fareast-language:NL-BE">
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:NL-BE"><a href="https://www.uantwerpen.be/ti"><span style="font-size:10.0pt;color:#1F4E79">https://www.uantwerpen.be/ti</span></a></span><u><span style="font-size:10.0pt;color:#00426A;mso-fareast-language:NL-BE">
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</span><span style="mso-fareast-language:NL-BE"><a href="mailto:yorick.debock@uantwerpen.be"><span style="font-size:10.0pt;color:#00426A">yorick.debock@uantwerpen.be</span></a><span style="color:#1F497D">
</span></span><span style="font-size:10.0pt;color:black;mso-fareast-language:NL-BE"><o:p></o:p></span></p>
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