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2025-11-14 - 12:03

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 highest latencies:
System rack9slot8s.osadl.org (updated Fri Nov 14, 2025 00:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8195010660,0irq/47-4a10000016656-1kworker/u3:019:05:170
81850870,0irq/46-4a10000017786-21ssh22:46:220
81850860,0irq/46-4a1000001697-21apt-get00:30:380
81850840,0irq/46-4a10000024482-21seq23:00:330
81950830,0irq/47-4a10000029760-21latency_hist20:19:550
81850830,0irq/46-4a10000012343-21ssh21:25:440
81850820,0irq/46-4a10000011894-21ssh22:33:550
81850820,0irq/46-4a10000010691-21ssh23:40:140
4862825,0sleep0495-21ssh22:09:480
282652820,0chrt27816-21kworker/u2:020:09:510
81950810,0irq/47-4a1000004731-21sh21:09:550
81850810,0irq/46-4a10000028309-21ssh23:08:520
81850810,0irq/46-4a10000015349-21ssh23:50:100
81850810,0irq/46-4a10000014253-21ssh22:38:580
81950800,0irq/47-4a10000024089-21kworker/u2:323:10:230
81850800,0irq/46-4a1000008388-21runrttasks21:17:320
81850800,0irq/46-4a10000016415-21ssh22:43:310
81850790,0irq/46-4a1000005269-21apt-get22:20:480
81850790,0irq/46-4a1000004316-21kworker/u2:021:13:160
81850790,0irq/46-4a10000019301-21ssh23:58:380
81850790,0irq/46-4a10000014631-21ssh21:30:130
231142790,0sleep010370-21kworker/u2:119:35:450
81950780,0irq/47-4a1000005042-21rm22:19:290
81850780,0irq/46-4a100000560-21kswapd022:59:170
81850780,0irq/46-4a10000018787-21ssh21:39:290
81850780,0irq/46-4a10000015201-21runrttasks23:32:020
81850780,0irq/46-4a10000012961-21ssh23:45:040
81950770,0irq/47-4a10000022927-21latency_hist19:34:520
81850770,0irq/46-4a1000008470-21ssh22:26:300
81850770,0irq/46-4a10000030719-21ssh00:22:400
81850770,0irq/46-4a10000027282-21ssh00:15:210
102962770,0chrt8121-21kworker/u2:121:21:270
81950760,0irq/47-4a1000008238-21latency_hist23:35:030
81950760,0irq/47-4a1000006468-21ssh00:40:030
81850760,0irq/46-4a10000031243-21ls23:15:020
81850760,0irq/46-4a10000024926-21ssh00:10:210
81850760,0irq/46-4a10000022147-21ssh21:46:310
81850760,0irq/46-4a10000019816-21kworker/u2:021:44:550
22372760,0chrt27816-21kworker/u2:020:52:530
81850750,0irq/46-4a10000031753-21runrttasks20:33:100
81850750,0irq/46-4a1000001546-21ssh00:29:420
310182750,0chrt27816-21kworker/u2:020:28:080
285622750,0chrt15016-21kworker/u2:622:00:100
274022750,0chrt23202-21kworker/u2:320:03:480
247502750,0chrt23202-21kworker/u2:319:46:560
224522757,0sleep020892-21kworker/u2:000:05:060
81950740,0irq/47-4a10000020047-21kworker/u2:222:55:000
81950740,0irq/47-4a10000015184-21lldpd23:20:060
263192740,0sleep026295-21kworker/u2:619:56:090
81950730,0irq/47-4a1000001115-21ssh22:10:550
81850730,0irq/46-4a10000020710-21ssh00:01:270
3942730,0sleep030840-21kworker/u2:420:39:570
261912730,0sleep022195-21kworker/u2:221:55:080
206392730,0sleep020311-21kworker/u2:519:19:410
192392730,0chrt16655-21kworker/u2:019:12:460
81950720,0irq/47-4a1000004246-21ssh23:26:360
81950720,0irq/47-4a10000019816-21kworker/u2:021:53:550
81950720,0irq/47-4a1000001291-21kworker/u2:120:49:550
81850720,0irq/46-4a10000010370-21kworker/u2:119:29:510
209632720,0sleep020311-21kworker/u2:519:21:100
81950710,0irq/47-4a10000025753-21sshd19:52:320
29682710,0chrt2791-21kworker/u2:120:57:520
294342710,0chrt29308-21kworker/u2:120:17:250
321322700,0sleep031588-21kworker/u2:120:35:170
241702700,0sleep010370-21kworker/u2:119:43:100
101640,0ktimersoftd/028960-21sshd20:14:350
81850560,0irq/46-4a1000000-21swapper21:01:370
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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