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2026-06-29 - 18:49

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 Mon Jun 29, 2026 12:44:21)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
819502080,0irq/46-4a10000020857-21kworker/0:307:08:300
35122810,0chrt1212-21kworker/u2:312:10:390
81950800,0irq/46-4a10000012086-21snmpd12:20:150
82050790,0irq/47-4a1000009234-21sshd09:19:270
82050790,0irq/47-4a10000018846-21munin-run10:20:040
81950790,0irq/46-4a1000003179-21seq08:40:020
81950790,0irq/46-4a10000012086-21snmpd08:24:180
81950780,0irq/46-4a1000007659-21seq09:10:020
81950780,0irq/46-4a10000019787-21apt-get10:25:020
262792780,0chrt26082-21kworker/u2:007:38:190
82050770,0irq/47-4a100000794-21runrttasks11:54:290
82050770,0irq/47-4a1000006905-21apt09:05:020
82050770,0irq/47-4a1000006476-21kworker/u2:009:10:310
82050770,0irq/47-4a10000031708-21idleruntime-cro08:15:010
82050770,0irq/47-4a10000019822-21apt-key10:25:070
82050770,0irq/47-4a10000012036-21sshd09:36:280
81950770,0irq/46-4a10000015394-21runrttasks09:59:330
82050760,0irq/47-4a10000015460-21kworker/u2:310:05:310
81950760,0irq/46-4a10000017892-21apt-get10:15:020
300182760,0chrt29757-21kworker/u2:308:03:240
292702760,0sleep029255-21kworker/u2:111:27:110
82050750,0irq/47-4a10000028007-21apt07:50:010
82050750,0irq/47-4a10000012086-21snmpd09:49:370
82050750,0irq/47-4a10000011012-21idleruntime-cro09:30:000
81950750,0irq/46-4a1000004345-21sshd12:16:270
81950750,0irq/46-4a10000023829-21kworker/u2:608:00:020
81950750,0irq/46-4a10000010282-21seq09:25:010
67942750,0sleep06601-21kworker/u2:012:33:100
306382750,0chrt30624-21kworker/u2:211:36:220
284252750,0chrt27606-21kworker/u2:107:52:350
241982750,0chrt18219-21kworker/u2:207:24:220
222042750,0sleep021605-21kworker/u2:307:13:480
82050740,0irq/47-4a10000031862-21munin-run11:45:010
82050740,0irq/47-4a10000026219-21kworker/u2:111:09:550
81950740,0irq/46-4a10000022191-21munin-run10:40:020
81950740,0irq/46-4a10000015927-21runrttasks10:02:390
272602740,0chrt26969-21kworker/u2:311:14:070
82050730,0irq/47-4a10000028145-21munin-run11:20:020
82050730,0irq/47-4a1000002787-21runrttasks12:07:200
82050730,0irq/47-4a1000002377-21cron12:04:590
82050730,0irq/47-4a10000018840-21kworker/u2:310:50:000
82050730,0irq/47-4a10000012086-21snmpd10:59:520
82050730,0irq/47-4a10000012086-21snmpd07:44:100
81950730,0irq/46-4a1000006149-21latency_hist09:00:000
81950730,0irq/46-4a10000030539-21runrttasks08:06:370
284732730,0sleep025468-21kworker/u2:711:21:410
255502730,0chrt23829-21kworker/u2:607:33:230
211212730,0sleep021033-21kworker/u2:010:32:290
82050720,0irq/47-4a10000027606-21kworker/u2:108:15:030
82050720,0irq/47-4a1000001212-21kworker/u2:312:29:590
74462720,0chrt7354-21kworker/u2:512:37:280
143942720,0sleep014329-21kworker/u2:509:52:230
82050710,0irq/47-4a10000012683-21sshd09:40:270
82050710,0irq/47-4a10000012086-21snmpd11:35:000
81950710,0irq/46-4a100000442-21kworker/u2:212:00:000
33432710,0sleep02799-21kworker/u2:508:40:180
226052710,0sleep022564-21kworker/u2:110:42:200
101710,0ktimersoftd/025369-21seq11:00:420
49232700,0sleep02799-21kworker/u2:508:51:150
45102700,0sleep04198-21kworker/u2:108:48:520
82050690,0irq/47-4a10000022593-21munin-node07:15:070
81950690,0irq/46-4a10000021650-21cyclictest11:50:020
82050680,0irq/47-4a1000001908-21sshd08:32:280
81950680,0irq/46-4a10000012093-21lldpd09:34:320
101640,0ktimersoftd/012113-21runrttasks08:28:390
82050550,0irq/47-4a10000011699-21cron07:27:000
21652994839,0cyclictest81950irq/46-4a10000010:55:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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