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2026-06-11 - 21:14

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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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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rack9slot8s.osadl.org (updated Thu Jun 11, 2026 12:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
820502880,0irq/47-4a10000022022-1kworker/u3:107:05:060
82050890,0irq/47-4a10000011045-21sendmail-msp12:40:010
81950890,0irq/46-4a10000012086-21snmpd08:44:250
82050870,0irq/47-4a1000008136-21apt-key08:50:070
82050860,0irq/47-4a10000012987-21sendmail09:20:020
82050850,0irq/47-4a1000004879-21sendmail12:00:000
82050850,0irq/47-4a1000003548-21sshd11:50:200
82050850,0irq/47-4a10000012086-21snmpd07:58:190
82050850,0irq/47-4a10000010012-21latency_hist09:00:050
82050840,0irq/47-4a1000004951-21http08:30:030
82050840,0irq/47-4a10000020216-21cp10:05:060
82050830,0irq/47-4a1000005276-21sshd08:30:200
82050830,0irq/47-4a10000026046-21df07:15:090
82050830,0irq/47-4a10000021119-21sshd10:10:200
82050830,0irq/47-4a10000012086-21snmpd09:20:120
82050830,0irq/47-4a10000012086-21snmpd08:09:170
82050830,0irq/47-4a1000001163-21munin-run11:35:010
82050820,0irq/47-4a1000009542-21apt12:30:010
82050820,0irq/47-4a1000006607-21munin-run08:40:020
82050820,0irq/47-4a10000031543-21sshd11:20:200
82050820,0irq/47-4a10000010717-21apt09:05:010
56122820,0chrt5262-21kworker/u2:412:04:560
82050810,0irq/47-4a10000031272-21sshd11:19:200
82050810,0irq/47-4a1000002697-21apt08:15:010
82050810,0irq/47-4a10000025436-21awk10:40:010
82050810,0irq/47-4a10000017104-21latency_hist09:45:040
82050810,0irq/47-4a10000015785-21sshd09:37:220
82050810,0irq/47-4a10000012086-21snmpd08:04:150
81950810,0irq/46-4a1000006488-21latency_hist12:10:050
81950810,0irq/46-4a10000030689-21cron07:45:000
256952810,0chrt19503-21kworker/u2:307:14:210
82050800,0irq/47-4a1000005621-21cron12:05:030
81950800,0irq/46-4a10000028400-21idleruntime-cro11:00:010
13942800,0sleep027957-21kworker/u2:011:36:010
82050790,0irq/47-4a1000009540-21kworker/u2:709:15:020
82050790,0irq/47-4a1000007583-21kworker/u2:312:20:000
82050790,0irq/47-4a1000003440-21cron08:20:010
82050790,0irq/47-4a10000032162-21munin-run07:55:010
82050790,0irq/47-4a10000019286-21sh10:00:010
82050790,0irq/47-4a10000017800-21kworker/u2:110:05:010
82050790,0irq/47-4a10000010278-21munin-run12:35:000
28532790,0chrt27957-21kworker/u2:011:45:370
221542790,0chrt22014-21kworker/u2:410:17:390
82050780,0irq/47-4a10000029338-21sshd07:35:190
82050780,0irq/47-4a10000027206-21kworker/u2:111:05:020
82050780,0irq/47-4a10000026705-21sshd10:48:200
81950780,0irq/46-4a10000030629-21apt11:15:010
80142780,0chrt5310-21kworker/u2:308:49:290
40742780,0sleep03804-21kworker/u2:508:24:070
273052780,0sleep027274-21kworker/u2:507:21:440
101780,0ktimersoftd/022555-21latency_hist10:20:030
82050770,0irq/47-4a1000008496-21seq12:22:340
82050770,0irq/47-4a1000005310-21kworker/u2:309:30:020
82050770,0irq/47-4a10000027563-21sshd10:54:210
82050770,0irq/47-4a1000002528-21runrttasks11:43:590
82050770,0irq/47-4a10000023934-21cron10:30:000
82050770,0irq/47-4a10000017796-21cron09:50:000
82050770,0irq/47-4a10000014643-21kworker/u2:109:35:010
82050770,0irq/47-4a10000012086-21snmpd09:54:390
325132770,0sleep029906-21kworker/u2:411:27:120
82050760,0irq/47-4a10000019503-21kworker/u2:307:35:020
310752760,0chrt28024-21kworker/u2:007:47:190
295952760,0sleep028386-21kworker/u2:211:07:400
281502760,0chrt19503-21kworker/u2:307:27:390
114232750,0sleep09540-21kworker/u2:709:09:570
81950740,0irq/46-4a10000024673-21modprobe10:35:000
260932740,0sleep021264-21kworker/u2:210:44:200
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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