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2026-05-20 - 17:21

OSADL QA Farm on Real-time of Mainline Linux

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

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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rackfslot4s.osadl.org (updated Wed May 20, 2026 12:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1680421310,2sleep016805-21seq09:59:280
1190221240,2chrt11899-21ntpq08:10:500
73721210,2chrt736-21/usr/sbin/munin09:35:370
1869321200,3chrt17322-21/usr/sbin/munin08:21:210
1833821200,4chrt18337-21seq10:50:130
1492221200,2chrt14917-21apt-get10:45:110
496721190,2chrt4968-21chrt11:18:310
1808321180,3chrt18081-21ssh11:38:060
1225921180,3chrt12257-21ld09:52:060
651121160,3chrt6512-21runrttasks08:02:020
443321150,2sleep04432-21seq10:29:260
392421150,3chrt3879-21apt-get09:40:160
2162421150,2chrt21623-21seq07:35:210
2317721140,3chrt23178-21runrttasks12:34:470
2466621120,3chrt24664-21nfs4_client12:36:150
1715321120,2chrt17152-21/usr/sbin/munin12:25:350
2525821110,3chrt25259-21ld10:11:340
885921100,2chrt8860-21chrt11:24:510
3002821060,2chrt30029-21awk11:07:150
1260621050,3chrt12607-21sleep09:04:180
206721020,3chrt2066-21awk08:46:250
2289021010,2chrt22891-21sleep08:28:100
783421000,2chrt7836-21sed08:55:500
224332980,2sleep022434-21cat10:56:030
19822950,2sleep01984-21swap12:02:190
238022930,2sleep023803-21chrt08:30:200
142512920,2sleep014254-21tr11:32:140
102382890,2sleep010239-21seq12:15:160
295552850,2sleep029556-21seq09:30:100
154312830,2sleep015433-21cat12:22:170
100482830,2sleep010049-21chrt12:15:030
44692820,2sleep04472-21apt08:00:000
310762740,1sleep031077-21seq10:20:500
125502710,2sleep012553-21cut10:41:070
36272700,1sleep03628-21chrt07:05:380
45242690,2sleep04527-21ls12:06:100
255932680,1sleep025594-21latency_hist11:50:040
5681906129,21cyclictest27908-21sshd09:27:110
321912600,1sleep032193-21ld07:51:160
5681905926,24cyclictest13506-21sshd07:21:100
5681905828,21cyclictest22147-21ssh10:06:570
5681905826,23cyclictest20390-21munin-run10:05:020
5681905824,15cyclictest31295-21runrttasks08:41:190
5681905730,20cyclictest22880-21apt-get09:20:140
5681905724,23cyclictest8176-21/usr/sbin/munin10:37:000
296212570,1sleep029623-21chrt10:18:200
5681905625,23cyclictest436-21runrttasks11:41:090
5681905625,22cyclictest28870-21apt-get11:55:530
5681905625,22cyclictest15981-21diskmemload09:47:060
5681905625,21cyclictest15921-21if_can007:25:400
5681905625,20cyclictest5313-21ssh10:30:420
5681905625,12cyclictest21057-21ntp_states09:16:560
144072560,1sleep014408-21chrt09:06:220
5681905531,14cyclictest9136-21apt-get11:25:250
5681905526,21cyclictest27791-21/usr/sbin/munin07:45:440
5681905524,22cyclictest27008-21ssh11:02:250
5681905524,22cyclictest17595-21ssh09:11:440
5681905435,12cyclictest5894-21awk07:10:070
5681905430,15cyclictest31615-21apt-get11:10:200
5681905423,23cyclictest27741-21users11:52:220
5681905422,23cyclictest26820-21/usr/sbin/munin08:35:230
5681905332,13cyclictest19175-21irqrtprio07:30:440
5681905323,21cyclictest14204-21apt-get08:15:250
5681905230,13cyclictest4925-21ntpq08:51:080
5681905229,14cyclictest10414-21ntpq07:16:160
5681905220,13cyclictest8653-21irqstats08:05:450
5681905122,21cyclictest25415-21cut07:40:430
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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