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2025-09-17 - 10:34

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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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Click here to display the system's profile data or here to proceed to next system.
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 rack4slot1s.osadl.org (updated Wed Sep 17, 2025 00:44:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3005021290,1sleep130051-21irqstats21:42:521
3005021290,1sleep130051-21irqstats21:42:521
2810621050,3sleep20-21swapper/200:32:492
2810621050,3sleep20-21swapper/200:32:492
2424521020,3sleep30-21swapper/300:22:493
146652880,1sleep00-21swapper/023:57:420
193662830,4sleep30-21swapper/322:42:573
126772800,4chrt0-21swapper/323:52:383
126772800,4chrt0-21swapper/323:52:383
204042730,2sleep20-21swapper/219:52:462
286122690,5sleep028615-21grep20:12:540
286122690,5sleep028615-21grep20:12:540
187632680,2sleep30-21swapper/300:07:503
187632680,2sleep30-21swapper/300:07:503
34262670,3sleep20-21swapper/221:57:522
34262670,3sleep20-21swapper/221:57:522
4998996544,14cyclictest55150irq/47-eth019:42:450
4998996544,14cyclictest55150irq/47-eth019:42:450
15252620,3chrt0-21swapper/021:52:520
15252620,3chrt0-21swapper/021:52:520
232522600,2sleep20-21swapper/221:22:592
232522600,2sleep20-21swapper/221:22:592
89762590,3chrt0-21swapper/322:17:353
499999587,10cyclictest181rcu_preempt19:27:441
499999587,10cyclictest181rcu_preempt19:27:441
499999587,10cyclictest181rcu_preempt19:27:441
167062580,2chrt16583-21/usr/sbin/munin00:02:480
167062580,2chrt16583-21/usr/sbin/munin00:02:480
312662570,3chrt0-21swapper/300:40:343
312662570,3chrt0-21swapper/300:40:343
246842570,2sleep023892-21/usr/sbin/munin21:28:000
499999561,7cyclictest181rcu_preempt00:07:471
499999561,7cyclictest181rcu_preempt00:07:471
179572560,3chrt0-21swapper/322:38:013
179572560,3chrt0-21swapper/322:38:013
499899541,45cyclictest6924-21sshd20:42:470
499899541,43cyclictest26378-21latency_hist23:02:460
499899541,43cyclictest26378-21latency_hist23:02:460
38552540,1sleep00-21swapper/021:57:580
38552540,1sleep00-21swapper/021:57:580
499999534,10cyclictest181rcu_preempt21:27:491
250132520,3sleep20-21swapper/222:57:542
250132520,3sleep20-21swapper/222:57:542
499899513,40cyclictest31772-21taskset00:42:430
321112510,2sleep032104-21tail21:47:540
321112510,2sleep032104-21tail21:47:540
222532510,2chrt22142-21latency_hist22:52:381
499999491,6cyclictest181rcu_preempt23:32:491
499999491,6cyclictest181rcu_preempt23:32:491
217782490,5sleep021782-21sendmail21:22:330
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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