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2026-04-30 - 14:59

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 Apr 30, 2026 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
820501170,0irq/47-4a10000025039-21ls07:10:010
82050890,0irq/47-4a10000018200-21ssh09:25:170
82050870,0irq/47-4a10000015790-21sendmail-msp09:20:020
81950870,0irq/46-4a1000008159-21apt-key10:15:060
81950870,0irq/46-4a10000028372-21runrttasks09:46:500
82050860,0irq/47-4a1000006774-21ssh11:25:400
82050850,0irq/47-4a1000004833-21ssh11:21:140
82050850,0irq/47-4a10000010950-21kworker/u2:610:25:560
82050840,0irq/47-4a1000003070-21awk08:15:000
82050840,0irq/47-4a10000026840-21kworker/u2:112:12:490
82050840,0irq/47-4a10000016453-21ssh11:47:590
82050830,0irq/47-4a1000005225-21kworker/u2:012:39:270
82050830,0irq/47-4a10000023568-21latency_hist10:50:040
82050830,0irq/47-4a10000012086-21snmpd10:44:570
81950830,0irq/46-4a1000009094-21ssh11:31:010
81950830,0irq/46-4a1000003743-21ssh11:18:560
81950830,0irq/46-4a10000012113-21runrttasks12:06:550
82050820,0irq/47-4a1000008978-21rm10:16:450
82050820,0irq/47-4a100000608-21ssh12:25:530
82050820,0irq/47-4a10000032609-21apt12:25:010
82050820,0irq/47-4a1000002179-21apt-config08:10:040
82050820,0irq/47-4a10000012086-21snmpd10:24:520
81950820,0irq/46-4a10000032347-21modprobe07:55:020
81950820,0irq/46-4a10000028324-21runrttasks12:15:060
81950820,0irq/46-4a10000026537-21kworker/u2:107:30:290
82050810,0irq/47-4a1000003430-21sshd08:17:020
82050810,0irq/47-4a10000031902-21ssh11:09:080
82050810,0irq/47-4a10000022345-21kworker/u2:712:04:280
82050810,0irq/47-4a10000020960-21ssh09:31:360
82050810,0irq/47-4a10000018671-21sshd10:39:020
82050810,0irq/47-4a10000016356-21ssh09:21:090
82050810,0irq/47-4a10000016039-21ssh10:32:560
82050810,0irq/47-4a10000012086-21snmpd09:14:340
81950810,0irq/46-4a10000032441-21ssh09:56:130
81950810,0irq/46-4a10000030250-21ssh09:51:090
81950810,0irq/46-4a10000019051-21ssh11:54:050
205512818,0sleep020556-21sh11:57:310
82050800,0irq/47-4a10000029868-21ssh11:04:290
82050800,0irq/47-4a10000024519-21sshd09:38:130
82050800,0irq/47-4a10000014495-21ssh11:43:270
82050800,0irq/47-4a10000011289-21diskmemload10:05:450
81950800,0irq/46-4a10000026738-21ssh09:43:100
28492800,0sleep0715-21kworker/u2:512:30:570
82050790,0irq/47-4a10000024204-21rm10:51:230
82050790,0irq/47-4a10000012086-21snmpd08:44:280
82050790,0irq/47-4a10000011208-21ssh11:35:340
81950790,0irq/46-4a1000001906-21ssh10:00:320
82050780,0irq/47-4a10000030854-21cron07:45:010
82050780,0irq/47-4a10000026951-21cron07:20:020
82050780,0irq/47-4a10000026020-21ssh10:55:300
81950780,0irq/46-4a10000031612-21modprobe07:50:010
81950780,0irq/46-4a1000001280-21ssh11:13:170
82050770,0irq/47-4a100000994-21kworker/u2:308:20:040
81950770,0irq/46-4a1000009773-21cron09:00:000
81950770,0irq/46-4a1000006107-21latency_hist08:35:020
81950770,0irq/46-4a10000030114-21munin-plugin-st07:40:010
82050760,0irq/47-4a10000025640-21sshd07:13:590
79092760,0sleep07189-21kworker/u2:108:46:450
278642760,0chrt26537-21kworker/u2:107:25:250
110952760,0sleep08567-21kworker/u2:609:08:330
82050750,0irq/47-4a10000012086-21snmpd08:29:250
82050740,0irq/47-4a1000009059-21munin-run08:55:010
82050740,0irq/47-4a10000012086-21snmpd09:04:310
275792730,0sleep025018-21kworker/u2:307:24:040
81950720,0irq/46-4a100000651-21sshd08:00:020
8122720,0sleep031915-21kworker/u2:208:00:300
82050700,0irq/47-4a1000005616-21kworker/u2:208:40:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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