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2026-06-03 - 05:11

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 Wed Jun 03, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3084322530,3sleep030841-21grep19:20:150
1705521150,3sleep017056-21sshd22:42:410
40921120,3sleep0424-21munin-run23:45:000
100432980,3sleep010041-21grep00:20:280
133172910,3sleep013353-21cut00:35:010
204182900,4sleep020471-21/usr/sbin/munin20:50:200
28457998358,15cyclictest24079-21runrttasks21:05:060
28457997951,16cyclictest28262-21systemctl23:25:250
28457997646,18cyclictest307-21munin-node23:45:090
28457997546,17cyclictest29419-21ntp_states23:30:210
28457997544,18cyclictest30583-21/usr/sbin/munin21:30:340
28457997449,16cyclictest1510-21seq21:42:190
28457997445,18cyclictest31673-21grep23:40:010
2730627420,31sleep027313-21df19:05:130
28457997351,13cyclictest19713-21sshd22:53:280
28457997348,14cyclictest11912-21seq22:22:490
28457997347,16cyclictest23978-21df_inode23:10:130
28457997347,14cyclictest3529-21ntpq21:50:220
28457997333,24cyclictest11351-21memory20:15:190
28457997246,17cyclictest7767-21runrttasks00:11:490
28457997233,24cyclictest4719-21ntpq00:00:240
28457997146,16cyclictest17704-21df_inode20:40:140
28457997144,15cyclictest2112-21ntpq23:50:210
28457997143,17cyclictest2887-21seq21:48:040
28457997143,16cyclictest3515-21sendmail_mailqu23:55:260
28457997138,20cyclictest288-21snmpd23:17:070
28457997046,16cyclictest8563-21latency_hist20:05:020
28457997046,16cyclictest12543-21df_inode20:20:140
28457997045,16cyclictest9988-21ntp_states22:15:210
28457997045,16cyclictest18393-21runrttasks22:48:080
28457997045,15cyclictest4822-21ntp_states21:55:220
28457997043,15cyclictest4710-21/usr/sbin/munin19:50:260
28457997037,20cyclictest19749-21chrt20:47:190
28457997036,19cyclictest25572-21memory21:10:190
28457997035,22cyclictest17503-21munin-run20:40:000
28457996947,14cyclictest24060-21latency_hist21:05:020
28457996945,15cyclictest3552-21if_eth019:45:150
28457996945,13cyclictest7074-21seq19:59:260
28457996944,15cyclictest15164-21/usr/sbin/munin22:35:210
28457996944,14cyclictest28848-21ntp_states19:10:220
28457996937,20cyclictest13934-21grep22:30:240
28457996845,15cyclictest13027-21runrttasks22:26:260
28457996844,16cyclictest8422-21/usr/sbin/munin22:10:120
28457996843,15cyclictest11181-21ntp_states00:25:230
28457996843,14cyclictest28622-21chrt21:20:420
28457996842,16cyclictest22572-21latency_hist23:05:010
28457996842,15cyclictest14715-21chrt20:28:220
28457996838,18cyclictest15049-21/usr/sbin/munin20:30:260
28457996837,19cyclictest26565-21/usr/sbin/munin23:20:150
28457996832,22cyclictest31837-21/usr/sbin/munin21:35:150
28457996832,21cyclictest26667-21/usr/sbin/munin21:15:130
28457996827,27cyclictest5725-21/usr/sbin/munin00:05:160
28457996745,14cyclictest21553-21runrttasks20:55:120
28457996745,14cyclictest1355-21latency_hist19:35:020
28457996743,14cyclictest8803-21threads00:15:290
28457996643,15cyclictest2551-21runrttasks19:40:220
28457996643,15cyclictest1481-21runrttasks19:35:480
28457996643,13cyclictest29673-21grep21:25:260
28457996642,14cyclictest30095-21chrt19:17:140
28457996634,20cyclictest7141-21/usr/sbin/munin22:05:270
28457996543,14cyclictest32381-21sshd19:29:260
28457996540,15cyclictest10974-21chrt20:14:340
28457996443,12cyclictest22686-21df23:05:130
28457996441,15cyclictest14716-21latency_hist00:40:020
28457996441,14cyclictest9463-21runrttasks20:07:390
28457996339,15cyclictest20030-21chrt22:55:090
28457996336,15cyclictest5903-21df22:00:130
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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