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2025-12-03 - 04:07

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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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Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 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 50 highest latencies:
System rack3slot3s.osadl.org (updated Wed Dec 03, 2025 00:43:58)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3446728212354,64sleep30-21swapper/319:06:163
3446149211198,6sleep00-21swapper/019:05:240
344691328752,10sleep10-21swapper/119:08:331
344687128352,9sleep20-21swapper/219:08:022
3447147993733,2cyclictest0-21swapper/321:40:283
39019802321,21sleep03575990-21diskmemload00:30:090
3447147992723,2cyclictest0-21swapper/323:30:283
344714799271,15cyclictest228-1kworker/3:1H+kblockd00:06:203
3447147992517,6cyclictest66550irq/131-enp1s0-TxRx-322:40:123
344714799251,20cyclictest3679818-21taskset22:10:523
36333002241,10sleep03575990-21diskmemload21:44:570
344714799242,17cyclictest3592863-21chrt21:20:133
344714799242,15cyclictest3523057-21taskset20:17:493
38533012231,2sleep20-21swapper/223:58:252
36146212230,2sleep30-21swapper/321:31:273
3447147992320,1cyclictest0-21swapper/319:45:223
3447147992319,2cyclictest0-21swapper/322:23:533
38131302221,10sleep03575990-21diskmemload23:34:200
344714799222,16cyclictest3497248-21chrt19:55:123
3447147992213,4cyclictest37065682sleep322:29:143
344714799221,17cyclictest3589460-21chrt21:15:483
344714799221,13cyclictest3842910-21taskset23:50:273
344714799220,14cyclictest3884023-21taskset00:16:453
344714799212,13cyclictest3670731-21taskset22:05:193
3447147992118,1cyclictest0-21swapper/323:46:163
3447147992118,1cyclictest0-21swapper/323:24:413
3447147992117,2cyclictest0-21swapper/322:55:173
3447147992116,2cyclictest0-21swapper/322:54:173
3447147992116,2cyclictest0-21swapper/300:00:193
344714799211,16cyclictest3623330-21chrt21:37:133
38302332201,13sleep03830264-21ssh23:45:120
344714799202,12cyclictest3737291-21taskset22:46:173
344714799202,12cyclictest3638609-21taskset21:45:313
3447147992017,1cyclictest0-21swapper/323:55:153
3447147992017,1cyclictest0-21swapper/320:05:133
3447147992017,1cyclictest0-21swapper/319:20:233
3447147992017,1cyclictest0-21swapper/300:25:143
3447147992016,2cyclictest0-21swapper/320:10:163
3447147992012,4cyclictest37561622sleep323:00:133
344714799201,12cyclictest3821745-21taskset23:40:013
344714799200,15cyclictest0-21swapper/319:15:583
36390902191,7sleep10-21swapper/121:46:181
344714799195,11cyclictest0-21swapper/320:00:143
344714799193,13cyclictest66550irq/131-enp1s0-TxRx-300:10:363
344714799192,13cyclictest3687990-21taskset22:15:463
344714799192,12cyclictest3914311-21taskset00:35:253
344714799192,12cyclictest3787148-21taskset23:17:473
344714799192,12cyclictest3772609-21taskset23:10:103
3447147991916,1cyclictest0-21swapper/323:05:203
3447147991915,2cyclictest0-21swapper/321:50:183
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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