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2026-08-02 - 09:52

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

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 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.
Unexpectedly long latencies may be caused by SMIs
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 rackcslot7s.osadl.org (updated Sun Aug 02, 2026 00:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
174345321360,9sleep00-21swapper/019:10:000
185121121170,4sleep13056-21PK-Backend00:15:001
174877921020,3sleep00-21swapper/019:20:230
174310028564,14sleep20-21swapper/219:06:062
174312127538,31sleep30-21swapper/319:06:233
174324026545,14sleep10-21swapper/119:07:531
18153472580,3sleep10-21swapper/122:30:191
17991272510,3sleep30-21swapper/321:45:143
139099500,3rtkit-daemon0-21swapper/220:29:443
139099490,3rtkit-daemon0-21swapper/222:24:203
139099370,3rtkit-daemon0-21swapper/222:31:362
17926612290,4sleep13056-21PK-Backend21:25:191
18069312270,2sleep20-21swapper/222:05:212
1743562992716,3cyclictest26-21ksoftirqd/100:08:061
174356299260,7cyclictest3056-21PK-Backend23:45:001
174356299260,7cyclictest3056-21PK-Backend23:45:001
1743562992522,2cyclictest251rcuc/123:57:061
174356299250,6cyclictest3056-21PK-Backend21:05:011
1743562992421,2cyclictest251rcuc/122:49:321
1743559992416,6cyclictest1788082-21grep21:15:000
174355999240,22cyclictest1749953-21wc19:25:160
139099240,4rtkit-daemon1389-21rtkit-daemon22:54:520
174356499236,3cyclictest141rcu_preempt23:20:162
174356299237,7cyclictest1747674-21seq19:20:071
174356299235,8cyclictest26-21ksoftirqd/122:59:461
1743562992320,2cyclictest3056-21PK-Backend23:09:281
1743562992319,3cyclictest251rcuc/120:10:011
1743559992321,1cyclictest0-21swapper/023:33:580
1743559992320,2cyclictest0-21swapper/023:27:350
139099230,4rtkit-daemon1389-21rtkit-daemon00:38:551
174356899220,3cyclictest1794872-21taskset21:32:493
1743564992220,1cyclictest0-21swapper/222:35:572
1743564992220,1cyclictest0-21swapper/222:35:572
1743564992217,3cyclictest34-21ksoftirqd/223:15:142
1743564992215,5cyclictest1798276-21sshd21:42:032
1743564992214,6cyclictest1808114-21fw_packets22:10:142
174356499220,21cyclictest0-21swapper/222:57:342
174356499220,21cyclictest0-21swapper/221:53:062
174356499220,21cyclictest0-21swapper/200:33:392
174356499220,20cyclictest1827365-21load23:05:172
174356299225,10cyclictest26-21ksoftirqd/120:50:161
1743562992220,1cyclictest0-21swapper/123:53:291
1743562992220,1cyclictest0-21swapper/120:38:281
1743562992219,2cyclictest3056-21PK-Backend19:46:091
1743562992219,2cyclictest3056-21PK-Backend19:46:091
1743562992219,2cyclictest3056-21PK-Backend00:24:111
174356299221,8cyclictest26-21ksoftirqd/122:15:171
1743562992218,3cyclictest251rcuc/122:45:001
1743562992218,3cyclictest251rcuc/122:45:001
174356299220,20cyclictest3056-21PK-Backend19:37:381
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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