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2026-05-31 - 17:57

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, slot #8

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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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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rack9slot8s.osadl.org (updated Sun May 31, 2026 12:44:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
820501850,0irq/47-4a10000010768-21seq07:09:030
82050900,0irq/47-4a10000018760-21sshd07:58:250
82050890,0irq/47-4a10000028405-21kworker/u2:209:20:020
82050880,0irq/47-4a1000002371-21munin-run09:45:010
82050880,0irq/47-4a10000022594-21sshd11:58:240
82050870,0irq/47-4a10000025414-21runrttasks12:15:370
82050860,0irq/47-4a10000026413-21apt08:50:010
82050860,0irq/47-4a10000016774-21awk07:45:020
82050850,0irq/47-4a10000028977-21sendmail-msp12:40:020
82050850,0irq/47-4a10000012086-21snmpd08:15:020
42132850,0sleep04176-21kworker/u2:409:57:090
82050840,0irq/47-4a1000006831-21runrttasks10:13:470
82050840,0irq/47-4a1000003426-21kworker/u2:109:55:020
82050840,0irq/47-4a10000024303-21apt12:10:010
82050840,0irq/47-4a10000014822-21kworker/u2:508:05:020
82050840,0irq/47-4a10000012086-21snmpd11:25:500
82050840,0irq/47-4a10000011297-21chrt07:10:340
82050840,0irq/47-4a10000010496-21kworker/u2:410:45:000
82050830,0irq/47-4a10000025069-21latency_hist12:15:030
82050830,0irq/47-4a10000022057-21kworker/u2:512:25:020
82050830,0irq/47-4a10000021480-21sshd08:16:250
82050830,0irq/47-4a10000019733-21latency_hist08:05:030
82050830,0irq/47-4a10000019380-21sshd11:36:260
82050830,0irq/47-4a10000014067-21kworker/u2:107:30:030
82050830,0irq/47-4a10000012343-21munin-node07:15:170
82050830,0irq/47-4a10000010496-21kworker/u2:410:40:000
82050830,0irq/47-4a10000010165-21latency_hist10:35:030
81950830,0irq/46-4a10000025687-21modprobe08:45:010
81950830,0irq/46-4a10000012086-21snmpd09:30:210
82050820,0irq/47-4a1000009432-21munin-run10:30:000
82050820,0irq/47-4a1000003124-21latency_hist09:50:020
82050820,0irq/47-4a10000027159-21kworker/u2:409:00:080
82050820,0irq/47-4a10000026815-21sshd08:52:250
82050820,0irq/47-4a10000015571-1kworker/u3:307:40:010
82050820,0irq/47-4a10000013708-21sshd07:24:260
82050820,0irq/47-4a10000012422-21munin-run10:50:020
150632820,0chrt14822-21kworker/u2:507:33:270
82050810,0irq/47-4a1000004174-21kworker/u2:310:00:140
82050810,0irq/47-4a10000027883-21sh09:00:000
82050810,0irq/47-4a10000020878-21sshd11:46:260
82050810,0irq/47-4a10000013153-21sh10:55:000
82050810,0irq/47-4a10000012086-21snmpd07:49:550
81950810,0irq/46-4a10000019108-21modprobe11:35:010
277292810,0chrt22057-21kworker/u2:512:31:140
82050800,0irq/47-4a1000007721-21sshd10:18:260
82050800,0irq/47-4a10000031615-21sshd09:23:250
82050800,0irq/47-4a10000014560-21sshd11:04:260
82050800,0irq/47-4a10000012086-21snmpd09:35:210
61072800,0chrt5770-21kworker/u2:610:08:520
82050790,0irq/47-4a1000008455-21runrttasks10:23:110
82050790,0irq/47-4a10000023237-21sshd12:02:260
82050790,0irq/47-4a10000016919-21latency_hist11:20:040
322662790,0chrt29155-21kworker/u2:009:27:420
299702790,0chrt23033-21kworker/u2:109:12:150
81950780,0irq/46-4a10000024918-21cron08:40:000
81950780,0irq/46-4a10000018223-21cron07:55:000
239112780,0chrt23437-21kworker/u2:308:32:570
152592780,0sleep012037-21kworker/u2:111:09:060
82050770,0irq/47-4a10000020578-21cron11:45:000
172072770,0chrt16865-21kworker/u2:611:21:420
135492770,0sleep012037-21kworker/u2:110:57:200
232572760,0chrt22282-21kworker/u2:608:28:370
156172750,0chrt14947-21kworker/u2:511:11:000
82050730,0irq/47-4a10000023160-21kworker/u2:412:30:000
101680,0ktimersoftd/029338-21runrttasks09:08:130
101660,0ktimersoftd/022582-21seq08:24:080
82050640,0irq/47-4a10000011699-21cron11:53:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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