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2026-04-11 - 05:36

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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.
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 rack5slot3s.osadl.org (updated Sat Apr 11, 2026 00:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
190412223147,24sleep20-21swapper/219:08:082
189022223192,21sleep00-21swapper/019:06:210
188552203166,25sleep30-21swapper/319:05:433
191422201165,24sleep10-21swapper/119:09:281
1791121480,3sleep11927599cyclictest21:30:211
475921180,4sleep11927599cyclictest21:00:191
226922650,2sleep00-21swapper/000:10:110
66752600,5sleep11927599cyclictest19:50:241
66752600,5sleep11927599cyclictest19:50:241
109182590,4sleep11927599cyclictest23:40:241
80742470,1sleep121-21rcuc/122:20:251
199812470,1sleep30-21swapper/321:35:173
1928599401,28cyclictest0-21swapper/322:49:513
19285993725,3cyclictest0-21swapper/320:06:113
1927099379,13cyclictest3256-21munin-run00:40:010
1927099379,13cyclictest3256-21munin-run00:40:010
115062370,2sleep39-21rcu_preempt21:15:223
19285993624,4cyclictest0-21swapper/319:37:033
1928599351,14cyclictest0-21swapper/323:30:033
1928599341,12cyclictest0-21swapper/300:13:153
1928099331,13cyclictest0-21swapper/221:28:012
1927599330,18cyclictest0-21swapper/120:13:211
1927099336,12cyclictest1374-21awk20:55:010
237662320,7sleep2311ktimersoftd/219:15:262
19285993212,4cyclictest7912-21sh23:35:153
1928599321,14cyclictest0-21swapper/319:10:103
1928599321,14cyclictest0-21swapper/300:00:273
1928099320,26cyclictest0-21swapper/221:10:492
1927599321,10cyclictest0-21swapper/120:02:251
1928599311,15cyclictest0-21swapper/321:26:473
1928099311,12cyclictest30239-21sshd23:10:412
1928099310,23cyclictest0-21swapper/222:31:162
1927599311,9cyclictest0-21swapper/123:30:291
1927599310,23cyclictest0-21swapper/119:31:451
1927599310,21cyclictest0-21swapper/120:31:291
1928599301,15cyclictest0-21swapper/321:52:233
1928599300,15cyclictest0-21swapper/322:07:353
1928599300,12cyclictest0-21swapper/322:31:433
1928099301,13cyclictest0-21swapper/220:48:572
1927599301,26cyclictest0-21swapper/121:07:131
1927599301,11cyclictest15857-21ntp_states21:25:211
1927099300,12cyclictest14545-21kworker/0:221:27:410
101952300,5sleep01927099cyclictest22:25:260
1928599291,26cyclictest0-21swapper/300:17:233
1928599291,19cyclictest18060-21ntp_states21:30:233
1928599291,12cyclictest0-21swapper/300:39:393
1928599291,12cyclictest0-21swapper/300:39:393
1928599290,11cyclictest13924-21switchtime21:20:253
1928099291,9cyclictest0-21swapper/220:28:052
1928099291,12cyclictest0-21swapper/222:45:322
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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