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2026-09-22 - 15:12

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #5

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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  Eltec
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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: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rack3slot5s.osadl.org (updated Tue Sep 22, 2026 12:43:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1536721740sleep0121650irq/29-eth0_g0_10:28:250
1394021710sleep1121650irq/29-eth0_g0_10:20:591
1211210ksoftirqd/1121750irq/30-eth0_g0_11:30:191
109421110sleep1121650irq/29-eth0_g0_11:41:001
1211080ksoftirqd/1121750irq/30-eth0_g0_10:13:151
121850ksoftirqd/1121650irq/29-eth0_g0_11:15:200
31782780sleep1121750irq/30-eth0_g0_11:50:261
116622630sleep0121750irq/30-eth0_g0_08:00:270
121570ksoftirqd/13011599cyclictest10:05:301
326232520chrt121750irq/30-eth0_g0_07:15:091
121500ksoftirqd/1121650irq/29-eth0_g0_10:55:081
121490ksoftirqd/1121750irq/30-eth0_g0_12:02:401
121490ksoftirqd/1121750irq/30-eth0_g0_10:19:171
60662480sleep0121750irq/30-eth0_g0_12:01:390
121650470irq/29-eth0_g0_31ksoftirqd/007:15:240
121460ksoftirqd/1121750irq/30-eth0_g0_10:47:231
121460ksoftirqd/1121650irq/29-eth0_g0_09:40:471
312912450sleep0121750irq/30-eth0_g0_11:33:200
121450ksoftirqd/1121750irq/30-eth0_g0_11:05:511
121650440irq/29-eth0_g0_1964-21runrttasks07:01:100
121440ksoftirqd/1121750irq/30-eth0_g0_09:58:391
121440ksoftirqd/1121750irq/30-eth0_g0_09:58:391
121440ksoftirqd/1121650irq/29-eth0_g0_11:02:031
121440ksoftirqd/1121650irq/29-eth0_g0_09:49:381
121650430irq/29-eth0_g0_1964-21runrttasks09:54:350
121430ksoftirqd/1121650irq/29-eth0_g0_11:25:291
3011599421cyclictest26066-21grep11:10:291
121750420irq/30-eth0_g0_121ksoftirqd/109:07:481
121650420irq/29-eth0_g0_31ksoftirqd/008:35:250
121650420irq/29-eth0_g0_31ksoftirqd/008:35:250
121650420irq/29-eth0_g0_13-21kworker/0:109:40:310
121420ksoftirqd/1121750irq/30-eth0_g0_12:34:010
121420ksoftirqd/1121750irq/30-eth0_g0_09:28:520
121420ksoftirqd/1121750irq/30-eth0_g0_09:25:561
3011599411cyclictest4687-21head11:55:311
3011599411cyclictest1995-21find07:20:281
121750410irq/30-eth0_g0_1219-21kworker/1:210:44:301
121750410irq/30-eth0_g0_1116-21iostat09:30:231
121650410irq/29-eth0_g0_165692sleep010:33:110
121650410irq/29-eth0_g0_13-21kworker/0:111:45:320
121650410irq/29-eth0_g0_13-21kworker/0:111:07:140
121410ksoftirqd/1121650irq/29-eth0_g0_10:59:041
3011599401cyclictest2215-21unixbench_multi11:45:331
121750400irq/30-eth0_g0_1219-21kworker/1:212:22:001
121750400irq/30-eth0_g0_0-21swapper/109:16:131
121650400irq/29-eth0_g0_31ksoftirqd/012:05:120
121650400irq/29-eth0_g0_31ksoftirqd/008:05:210
121650400irq/29-eth0_g0_13-21kworker/0:111:50:190
121650400irq/29-eth0_g0_13-21kworker/0:111:40:110
121650400irq/29-eth0_g0_13-21kworker/0:111:01:400
121650400irq/29-eth0_g0_13-21kworker/0:110:45:570
121650400irq/29-eth0_g0_13-21kworker/0:109:45:310
121650400irq/29-eth0_g0_13-21kworker/0:109:10:420
121650400irq/29-eth0_g0_11878-21latency_hist10:15:090
121400ksoftirqd/1121750irq/30-eth0_g0_12:28:040
121400ksoftirqd/1121750irq/30-eth0_g0_10:56:020
3011599391cyclictest15994-21awk10:30:241
121650390irq/29-eth0_g0_13550-21ntpdc10:20:250
121650390irq/29-eth0_g0_13-21kworker/0:112:20:310
121650390irq/29-eth0_g0_13-21kworker/0:112:16:280
121650390irq/29-eth0_g0_13-21kworker/0:111:36:040
121650390irq/29-eth0_g0_13-21kworker/0:110:41:110
121390ksoftirqd/1121750irq/30-eth0_g0_10:52:150
121390ksoftirqd/1121750irq/30-eth0_g0_10:17:380
121390ksoftirqd/1121750irq/30-eth0_g0_10:07:540
121390ksoftirqd/1121750irq/30-eth0_g0_10:00:290
121390ksoftirqd/1121750irq/30-eth0_g0_09:58:210
121390ksoftirqd/1121750irq/30-eth0_g0_09:58:210
121390ksoftirqd/1121750irq/30-eth0_g0_09:40:060
121390ksoftirqd/1121750irq/30-eth0_g0_09:20:110
121390ksoftirqd/1121750irq/30-eth0_g0_09:20:050
121390ksoftirqd/1121750irq/30-eth0_g0_09:02:480
121390ksoftirqd/1121750irq/30-eth0_g0_08:57:290
121390ksoftirqd/1121750irq/30-eth0_g0_08:33:500
121390ksoftirqd/1121750irq/30-eth0_g0_08:19:570
121390ksoftirqd/1121650irq/29-eth0_g0_09:51:431
3011599381cyclictest6983-21ps12:05:281
3011599381cyclictest27118-21diskmemload12:15:071
3011599381cyclictest18032-21unixbench_multi08:25:301
3011599381cyclictest17357-21zcat10:35:251
3011599381cyclictest15225-21cat08:15:221
121750380irq/30-eth0_g0_31ksoftirqd/009:08:510
121750380irq/30-eth0_g0_0-21swapper/111:16:391
121650380irq/29-eth0_g0_31ksoftirqd/008:40:230
121650380irq/29-eth0_g0_29219-21wc07:00:241
121380ksoftirqd/1121750irq/30-eth0_g0_11:55:180
121380ksoftirqd/1121750irq/30-eth0_g0_09:34:230
3011599371cyclictest29076-21unixbench_multi09:10:311
3011599371cyclictest25434-21unixbench_singl08:55:311
121750370irq/30-eth0_g0_298462sleep011:25:460
121750370irq/30-eth0_g0_1219-21kworker/1:212:25:421
121750370irq/30-eth0_g0_1219-21kworker/1:211:35:351
121750370irq/30-eth0_g0_1219-21kworker/1:210:00:361
121750370irq/30-eth0_g0_12114-21sshd08:01:451
121750370irq/30-eth0_g0_121ksoftirqd/112:34:121
121750370irq/30-eth0_g0_0-21swapper/111:23:441
121650370irq/29-eth0_g0_24136-21sort08:50:300
121650370irq/29-eth0_g0_22840-21find08:45:290
121650370irq/29-eth0_g0_1964-21runrttasks10:37:470
121650370irq/29-eth0_g0_14255-21zcat08:10:280
121650370irq/29-eth0_g0_121ksoftirqd/110:25:171
121370ksoftirqd/1121650irq/29-eth0_g0_08:42:231
121370ksoftirqd/1121650irq/29-eth0_g0_08:07:291
3011599362cyclictest9154-21cat12:15:221
3011599362cyclictest24063-21/usr/sbin/munin08:50:291
3011599361cyclictest7016-21unixbench_multi07:40:301
3011599361cyclictest5539-21ntp_offset07:35:241
3011599361cyclictest30866-21grep07:05:301
3011599361cyclictest16879-21grep08:20:301
121750360irq/30-eth0_g0_0-21swapper/109:00:301
121650360irq/29-eth0_g0_8220-21find12:10:280
121650360irq/29-eth0_g0_7039-21taskset07:40:310
121650360irq/29-eth0_g0_31506-21df_abs07:10:220
121650360irq/29-eth0_g0_31ksoftirqd/011:14:490
121650360irq/29-eth0_g0_1964-21runrttasks08:27:160
121650360irq/29-eth0_g0_1964-21runrttasks07:55:340
121650360irq/29-eth0_g0_1964-21runrttasks07:46:200
121650360irq/29-eth0_g0_1964-21runrttasks07:25:340
121650360irq/29-eth0_g0_13-21kworker/0:111:21:110
121650360irq/29-eth0_g0_121ksoftirqd/109:23:411
121360ksoftirqd/12753-21taskset07:25:201
3011599351cyclictest2718-21grep09:35:281
3011599351cyclictest19317-21unixbench_singl08:30:301
3011599351cyclictest0-21swapper/108:10:261
121650350irq/29-eth0_g0_1964-21runrttasks07:54:220
121650350irq/29-eth0_g0_1964-21runrttasks07:36:330
121650350irq/29-eth0_g0_1964-21runrttasks07:20:270
121350ksoftirqd/1121750irq/30-eth0_g0_08:24:290
121350ksoftirqd/1121650irq/29-eth0_g0_07:50:271
3011599341cyclictest228642sleep108:45:301
121650340irq/29-eth0_g0_4599-21head07:30:300
121650340irq/29-eth0_g0_19848-21runrttasks08:35:151
121650340irq/29-eth0_g0_19848-21runrttasks08:35:151
121340ksoftirqd/1121750irq/30-eth0_g0_07:05:310
3011599331cyclictest0-21swapper/107:47:581
121750330irq/30-eth0_g0_532-21runrttasks07:15:251
3011599321cyclictest0-21swapper/107:57:461
3011599321cyclictest0-21swapper/107:31:231
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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