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2026-04-16 - 02:36

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 Wed Apr 15, 2026 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1874221230,0chrt18355-21kworker/u2:407:09:320
81950870,0irq/46-4a1000003326-21cron10:15:000
82050820,0irq/47-4a10000023916-21munin-run09:50:020
81950820,0irq/46-4a10000019690-21chrt07:15:040
82050800,0irq/47-4a1000006958-21rm10:22:380
82050800,0irq/47-4a1000002549-21ssh12:30:260
82050800,0irq/47-4a10000020501-21ssh10:51:260
81950800,0irq/46-4a10000032666-21ssh12:25:470
82050790,0irq/47-4a10000017448-21dpkg10:45:060
82050790,0irq/47-4a10000012086-21snmpd11:37:380
81950790,0irq/46-4a10000015864-21ssh11:50:150
81950790,0irq/46-4a10000013799-21ssh11:45:550
82050780,0irq/47-4a1000007240-21idleruntime-cro09:15:020
82050780,0irq/47-4a10000027195-21sshd08:03:100
82050780,0irq/47-4a10000023511-21kworker/u2:312:10:460
82050780,0irq/47-4a1000001457-21sendmail-msp11:20:030
81950780,0irq/46-4a10000028663-21ssh10:00:020
81950780,0irq/46-4a10000019765-21ssh10:50:000
43722780,0sleep04366-21kworker/u2:109:06:140
20482780,0chrt20599-21kworker/u2:011:21:080
82050770,0irq/47-4a10000024729-21ssh12:09:070
82050770,0irq/47-4a10000012733-21ssh11:43:470
81950770,0irq/46-4a1000003523-21runrttasks10:15:130
81950770,0irq/46-4a10000030516-21ssh12:21:110
81950770,0irq/46-4a10000029858-21cron12:20:000
81950770,0irq/46-4a10000023613-21seq10:58:080
81950770,0irq/46-4a10000018934-21ssh09:39:350
81950770,0irq/46-4a10000018722-21runrttasks11:56:200
81950770,0irq/46-4a10000013590-21ssh10:36:480
81950770,0irq/46-4a10000011613-21ssh10:32:370
81950770,0irq/46-4a10000010413-21ssh10:30:030
257142770,0chrt25484-21kworker/u2:407:53:180
213842770,0chrt19125-21kworker/u2:207:24:110
16422770,0sleep0340-21kworker/u2:408:48:150
87152760,0chrt5543-21kworker/u2:209:18:020
82050760,0irq/47-4a1000008489-21apt11:35:010
82050760,0irq/47-4a10000029843-21ssh11:11:180
82050760,0irq/47-4a10000029434-21kworker/u2:410:09:350
82050760,0irq/47-4a10000015529-21ssh09:32:170
82050750,0irq/47-4a10000027236-21ssh11:05:420
82050750,0irq/47-4a10000026688-21munin-run08:00:030
81950750,0irq/46-4a10000031057-21ssh10:05:040
81950750,0irq/46-4a10000027809-21chrt08:05:360
81950750,0irq/46-4a10000024607-21latency_hist11:00:060
81950750,0irq/46-4a10000012113-21runrttasks09:51:070
48622750,0chrt4542-21kworker/u2:111:27:110
38872750,0sleep03737-21kworker/u2:009:03:170
312882750,0chrt28705-21kworker/u2:408:29:400
222132750,0chrt20295-21kworker/u2:407:29:570
82050740,0irq/47-4a10000023717-21munin-run07:40:020
82050740,0irq/47-4a10000022231-21ssh12:03:500
82050740,0irq/47-4a10000020171-21kworker/u2:709:42:330
81950740,0irq/46-4a1000006760-21rm12:39:480
243262740,0chrt22227-21kworker/u2:507:43:590
140072740,0sleep012878-21kworker/u2:109:29:090
82050730,0irq/47-4a100000688-1kworker/u3:108:55:010
81950730,0irq/46-4a1000009-21ksoftirqd/009:25:000
81950730,0irq/46-4a10000019125-21kworker/u2:207:15:150
246022730,0chrt23205-21kworker/u2:307:45:120
82050720,0irq/47-4a10000032366-21kworker/u2:308:36:350
82050720,0irq/47-4a10000022482-21sshd07:31:100
302962720,0sleep030116-21kworker/u2:608:22:350
82050710,0irq/47-4a100000340-21kworker/u2:408:45:010
82050710,0irq/47-4a10000032081-21munin-run08:35:010
82050710,0irq/47-4a10000029462-21kworker/u2:108:20:020
82050700,0irq/47-4a10000028705-21kworker/u2:408:15:020
101670,0ktimersoftd/03357-21apt09:00:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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