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2025-09-18 - 22:48

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, slot #5

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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  Phytec
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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

Data to construct the above plot have been generated using the RT test utility cyclictest.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackbslot5s.osadl.org (updated Thu Sep 18, 2025 12:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2694317994935,9cyclictest311ktimers/208:50:132
2694313994941,5cyclictest2763796-21kworker/u8:1+events_unbound10:41:151
2694309994838,6cyclictest2763518-21grep10:25:250
2694317994739,4cyclictest2808683-21sendmail12:40:002
2694313994737,7cyclictest2723558-21grep08:30:241
2694320994638,6cyclictest391ktimers/307:55:173
2694317994638,4cyclictest2694301-21cyclictest09:21:042
2694317994637,5cyclictest2747955-21unixbench_singl09:40:272
2694309994539,4cyclictest2729071-21kworker/u8:2+events_unbound08:51:020
2694313994334,6cyclictest2741088-21unixbench_multi09:20:261
2694313994231,7cyclictest2798048-21grep12:05:291
2694313994031,6cyclictest2743242-21cron09:30:001
2694313994031,6cyclictest2743242-21cron09:30:001
2694320993929,6cyclictest0-21swapper/307:15:203
2694320993929,6cyclictest0-21swapper/307:15:203
2694320993928,7cyclictest2718928-21sh08:20:003
2694313993929,5cyclictest0-21swapper/112:10:151
269430999393,5cyclictest131rcu_preempt10:30:130
2694309993933,4cyclictest2701467-21kworker/u8:0+events_unbound07:35:280
2694317993830,4cyclictest0-21swapper/207:40:012
2694317993825,9cyclictest311ktimers/210:20:162
2694317993729,4cyclictest0-21swapper/209:55:172
2694317993728,4cyclictest0-21swapper/207:20:202
2694313993730,4cyclictest2746658-21sendmail09:40:001
2694313993727,6cyclictest0-21swapper/111:15:251
2694309993726,7cyclictest2723559-21grep08:30:240
2694309993726,6cyclictest0-21swapper/012:00:000
2694320993625,7cyclictest0-21swapper/308:05:013
2694313993626,6cyclictest0-21swapper/108:25:221
269431399361,4cyclictest131rcu_preempt11:30:131
2694309993627,5cyclictest2734279-21grep09:00:230
269430999362,4cyclictest131rcu_preempt09:10:130
2694309993620,12cyclictest121ktimers/007:10:130
2694317993527,4cyclictest2786315-21munin-plugin-st11:35:002
2694313993526,5cyclictest2699953-21cron07:25:001
2694313993523,8cyclictest2727240-21grep08:40:261
2694320993426,4cyclictest0-21swapper/310:45:263
2694320993425,5cyclictest2738117-21debian-sa109:15:003
2694313993425,5cyclictest0-21swapper/108:20:001
2694313993423,7cyclictest0-21swapper/111:20:261
2694309993423,7cyclictest2701263-21grep07:25:290
2694309993418,4cyclictest2729071-21kworker/u8:2+events_unbound09:59:050
2694320993327,4cyclictest2794827-21grep12:00:003
2694320993325,4cyclictest0-21swapper/310:25:003
2694320993325,4cyclictest0-21swapper/308:05:283
2694320993324,5cyclictest0-21swapper/310:10:013
2694317993324,6cyclictest2697832-21grep07:15:252
2694317993324,6cyclictest2697832-21grep07:15:252
2694317993323,6cyclictest0-21swapper/208:30:012
2694313993326,5cyclictest2747084-21fschecks_time09:40:181
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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