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2026-05-28 - 22:11

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack4slot6s.osadl.org (updated Thu May 28, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3212322600,3sleep032121-21grep08:15:180
2282122550,2sleep022817-21cat07:40:010
387322470,2sleep03876-21timerandwakeup08:30:270
2253522380,3sleep022534-21latency_hist11:50:010
1362221310,2sleep013621-21sort09:10:010
2818021270,5chrt28177-21if_eth008:00:150
869221190,3chrt8690-21interrupts08:50:160
3065421170,4chrt30655-21/usr/sbin/munin10:15:170
2409621160,3chrt24099-21latency_hist07:45:010
262921100,3sleep0285-21sshd10:31:150
1886521060,3sleep018864-21latency_hist09:30:010
1546921000,2sleep015471-21mailstats09:15:270
8692970,4sleep0933-21/usr/sbin/munin12:30:240
178662940,3sleep017933-21switchtime11:30:260
29382930,3sleep02983-21cat12:40:010
125032895,9sleep012531-21/usr/sbin/munin11:10:200
165132874,9sleep016568-21interrupts07:15:150
34202850,3sleep03475-21ntpq10:35:180
167812850,3sleep016848-21/usr/sbin/munin09:20:270
95502840,4sleep09583-21latency_hist11:00:010
180802830,3sleep018148-21/usr/sbin/munin07:20:260
71292825,65sleep07143-21munin-plugin-st08:44:590
150252770,4sleep015037-21latency_hist07:10:010
290882765,57sleep029120-21latency_hist10:10:010
229422740,2sleep022939-21ps11:50:240
15049996523,15cyclictest20465-21runrttasks09:35:200
15049996027,23cyclictest25177-21runrttasks07:48:390
15049996012,18cyclictest4809-21ntp_states10:40:210
1504999599,19cyclictest13722-21/usr/sbin/munin09:10:180
1504999598,17cyclictest19011-21if_eth009:30:150
15049995933,15cyclictest20159-21/usr/sbin/munin11:40:150
15049995929,22cyclictest27327-21runrttasks12:07:330
1504999589,20cyclictest24138-21ntpq11:55:180
1504999589,16cyclictest29219-21/usr/sbin/munin10:10:150
1504999589,16cyclictest25470-21/usr/sbin/munin07:50:300
1504999588,17cyclictest29612-21ntpq08:05:190
15049995833,15cyclictest24134-21/usr/sbin/munin09:50:140
15049995833,15cyclictest15221-21/usr/sbin/munin07:10:140
15049995832,17cyclictest10099-21/usr/sbin/munin08:55:190
15049995810,17cyclictest7803-21/usr/sbin/munin08:45:290
15049995810,15cyclictest26649-21/usr/sbin/munin10:00:240
1504999579,17cyclictest25336-21/usr/sbin/munin09:55:230
1504999579,15cyclictest31826-21/usr/sbin/munin10:20:140
1504999579,15cyclictest21613-21sshd09:40:150
1504999579,15cyclictest13839-21ntpq11:15:240
1504999578,17cyclictest16074-21latency_hist11:25:010
15049995732,16cyclictest29283-21/usr/sbin/munin12:15:180
15049995732,15cyclictest10178-21/usr/sbin/munin11:00:260
1504999569,16cyclictest11155-21/usr/sbin/munin11:05:160
1504999568,15cyclictest27751-21/usr/sbin/munin12:10:260
1504999567,17cyclictest30544-21memory12:20:170
15049995633,15cyclictest4747-21/usr/sbin/munin08:35:160
15049995633,14cyclictest18815-21/usr/sbin/munin11:35:140
15049995632,16cyclictest16659-21runrttasks11:25:260
15049995631,16cyclictest20439-21/usr/sbin/munin07:30:150
15049995630,15cyclictest19832-21runrttasks07:27:060
15049995626,19cyclictest23931-21latency_hist09:50:020
1504999559,17cyclictest11140-21/usr/sbin/munin09:00:240
1504999559,14cyclictest6423-21sshd10:45:330
1504999558,18cyclictest1076-21ntp_states08:20:220
1504999558,16cyclictest31639-21/usr/sbin/munin12:25:210
1504999558,16cyclictest25691-21cat12:00:270
1504999558,15cyclictest7087-21/usr/sbin/munin10:50:100
1504999558,15cyclictest30779-21sshd08:10:150
15049995430,14cyclictest682-21/usr/sbin/munin10:25:090
15049995427,17cyclictest2192-21if_eth008:25:150
1504999537,15cyclictest26755-21/usr/sbin/munin07:55:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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