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2026-05-10 - 09:03

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 100 highest latencies:
System rack9slot8s.osadl.org (updated Sun May 10, 2026 00:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
288762368134,0sleep028854-21kworker/0:219:05:260
2126629219,0sleep011625-21in:imuxsock21:45:240
14232880,0chrt722-21kworker/u2:319:36:170
82050860,0irq/47-4a1000003921-21cron23:25:000
82050860,0irq/47-4a10000018106-21sshd21:25:240
81950860,0irq/46-4a1000005684-21apt-config20:05:040
82050850,0irq/47-4a100000357-21runrttasks23:02:020
82050850,0irq/47-4a10000029509-21readlink22:40:090
82050850,0irq/47-4a10000012086-21snmpd22:52:530
82050850,0irq/47-4a10000010794-21runrttasks20:38:160
99382840,0chrt9785-21kworker/u2:320:32:200
82050840,0irq/47-4a1000005657-21seq23:36:130
82050840,0irq/47-4a10000028541-21idleruntime-cro22:35:000
82050840,0irq/47-4a1000001497-21apt23:10:010
82050840,0irq/47-4a10000012086-21snmpd23:48:040
82050840,0irq/47-4a10000012086-21snmpd21:17:320
82050840,0irq/47-4a10000012086-21snmpd20:47:260
81950840,0irq/46-4a10000012113-21runrttasks00:04:490
82050830,0irq/47-4a10000031233-21kworker/u2:223:10:330
82050830,0irq/47-4a10000030970-21awk22:50:010
82050830,0irq/47-4a10000022189-21kworker/u2:121:55:020
82050830,0irq/47-4a10000012086-21snmpd22:37:500
82050830,0irq/47-4a10000010859-21kworker/u2:000:30:130
111092830,0chrt7210-21kworker/u2:300:13:170
82050820,0irq/47-4a1000007045-21runrttasks20:12:590
82050820,0irq/47-4a1000004671-21latency_hist23:30:020
82050820,0irq/47-4a1000004297-21sshd19:55:240
82050820,0irq/47-4a1000001890-21kworker/u2:419:50:030
82050820,0irq/47-4a10000012282-21sshd00:20:240
81950820,0irq/46-4a1000008252-21runrttasks23:54:070
81950820,0irq/46-4a10000031377-21cron19:20:000
81950820,0irq/46-4a10000012086-21snmpd20:57:280
78862820,0sleep05179-21kworker/u2:620:18:460
62322820,0chrt6123-21kworker/u2:220:07:240
250212820,0chrt23596-21kworker/u2:122:10:480
137652820,0chrt13360-21kworker/u2:800:29:530
85352810,0sleep07959-21kworker/u2:223:55:270
82050810,0irq/47-4a10000025904-21cron22:17:000
82050810,0irq/47-4a10000024084-21apt22:05:000
82050810,0irq/47-4a10000018956-21dpkg21:30:110
82050810,0irq/47-4a10000015495-21sendmail-msp00:40:010
82050810,0irq/47-4a10000014775-21/usr/sbin/munin21:05:020
82050810,0irq/47-4a10000014358-21kworker/u2:421:10:090
82050810,0irq/47-4a10000012086-21snmpd20:27:220
6782810,0chrt32429-21kworker/u2:019:31:200
37532810,0chrt3648-21kworker/u2:319:51:590
323442810,0chrt27383-21kworker/u2:022:59:230
154032810,0sleep013579-21kworker/u2:221:09:180
82050800,0irq/47-4a1000007959-21kworker/u2:200:10:020
82050800,0irq/47-4a10000031673-21sshd19:21:250
82050800,0irq/47-4a10000020366-21munin-run21:40:020
30332800,0sleep02774-21kworker/u2:323:18:580
82050790,0irq/47-4a1000009159-21kworker/u2:020:55:010
82050790,0irq/47-4a1000001890-21kworker/u2:419:45:020
82050790,0irq/47-4a10000012086-21snmpd22:28:240
81950790,0irq/46-4a10000023329-21idleruntime-cro22:00:000
81950790,0irq/46-4a10000011612-21kworker/u2:100:17:000
51362790,0sleep03165-21kworker/u2:423:32:580
270452790,0sleep026293-21kworker/u2:422:24:590
82212780,0sleep05179-21kworker/u2:620:20:200
82050780,0irq/47-4a10000017954-21apt21:25:010
66122780,0sleep05685-21kworker/u2:123:42:460
81950760,0irq/46-4a10000020886-21sshd21:43:160
112492760,0chrt10536-21kworker/u2:220:40:470
81950750,0irq/46-4a10000024821-21ls22:10:000
301302750,0sleep029080-21kworker/u2:219:14:280
326472740,0chrt32429-21kworker/u2:019:28:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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