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2026-05-31 - 02:39

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #6

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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  Intel
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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.
Unexpectedly long latencies may be caused by SMIs
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 100 highest latencies:
System rack1slot6s.osadl.org (updated Sun May 31, 2026 00:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
733621150,4sleep229-21ksoftirqd/200:22:172
11897991034,92cyclictest0-21swapper/021:33:170
11902991015,27cyclictest1227-21runrttasks19:59:431
2239821000,4sleep2281ktimersoftd/222:19:392
119029910022,14cyclictest0-21swapper/119:48:181
219499990,7rtkit-daemon0-21swapper/121:57:361
219499990,6rtkit-daemon6742-21yum21:08:381
219499990,6rtkit-daemon0-21swapper/121:52:071
1190299975,26cyclictest0-21swapper/123:08:151
1190299975,26cyclictest0-21swapper/123:08:151
1190299964,26cyclictest0-21swapper/100:08:121
11902999519,10cyclictest13774-21ssh22:54:441
1189799953,84cyclictest1881-21ssh22:38:140
1190299946,24cyclictest0-21swapper/121:23:181
1190299945,26cyclictest16357-21ssh00:33:291
1190299945,24cyclictest1227-21runrttasks22:44:251
1189799944,81cyclictest0-21swapper/023:23:220
1190299935,13cyclictest25243-21crond21:38:011
1189799934,66cyclictest1146-21ssh00:13:090
1189799933,82cyclictest0-21swapper/021:40:370
1189799933,82cyclictest0-21swapper/020:55:290
1189799932,85cyclictest0-21swapper/019:33:070
1190299925,25cyclictest0-21swapper/100:05:321
11902999223,10cyclictest10091-21ssh00:25:031
11902999221,9cyclictest26727-21latency_hist22:28:001
11902999218,13cyclictest0-21swapper/123:28:141
1189799924,71cyclictest0-21swapper/023:12:110
1189799924,71cyclictest0-21swapper/023:12:110
1189799923,83cyclictest0-21swapper/022:21:230
1189799923,82cyclictest0-21swapper/022:46:020
1189799923,81cyclictest0-21swapper/023:59:120
11902999130,50cyclictest27356-21systemd-cgroups20:48:031
1189799913,81cyclictest0-21swapper/022:03:180
1189799913,80cyclictest31325-21idleruntime22:33:200
1189799913,80cyclictest0-21swapper/023:33:270
1189799913,80cyclictest0-21swapper/023:29:290
1190299904,29cyclictest0-21swapper/122:08:341
1190299904,26cyclictest0-21swapper/121:58:231
1190299904,23cyclictest8461-21ssh22:48:111
1190299904,14cyclictest0-21swapper/119:56:281
1190299903,25cyclictest19906-21aten_r1power_en23:53:091
11902999020,14cyclictest0-21swapper/123:06:401
11902999020,14cyclictest0-21swapper/123:06:401
11902999013,21cyclictest0-21swapper/122:03:191
11902999011,13cyclictest0-21swapper/122:38:301
1189799905,66cyclictest0-21swapper/023:03:150
1189799905,66cyclictest0-21swapper/023:03:150
1189799903,81cyclictest16957-21runrttasks00:35:240
1189799903,81cyclictest0-21swapper/021:50:130
1189799903,80cyclictest16657-21sa119:18:060
1189799903,80cyclictest0-21swapper/023:16:580
1189799903,80cyclictest0-21swapper/000:20:520
1189799903,79cyclictest0-21swapper/023:38:250
1189799903,63cyclictest0-21swapper/022:09:070
1190299895,34cyclictest0-21swapper/122:18:001
1190299894,35cyclictest0-21swapper/123:37:571
1190299894,26cyclictest0-21swapper/100:17:491
1190299893,28cyclictest29825-21hwlatdetect21:43:221
1190299893,28cyclictest29825-21hwlatdetect21:43:221
11902998929,9cyclictest14393-21wc20:18:281
11902998915,10cyclictest27273-21unixbench_multi21:38:351
1189799893,79cyclictest0-21swapper/023:18:400
1189799893,79cyclictest0-21swapper/021:09:580
1189799893,78cyclictest30573-21timerwakeupswit21:43:340
1189799893,78cyclictest30573-21timerwakeupswit21:43:340
1189799893,78cyclictest0-21swapper/022:28:240
1190299885,28cyclictest0-21swapper/120:03:181
1190299885,26cyclictest0-21swapper/119:44:411
1190299885,11cyclictest2220-21udisks-daemon23:46:221
1190299884,26cyclictest0-21swapper/100:19:191
1190299884,23cyclictest0-21swapper/123:21:081
11902998813,12cyclictest9605-21nfs_client21:13:311
1189799884,76cyclictest0-21swapper/023:54:170
1189799883,78cyclictest13842-21grep23:43:160
1189799882,79cyclictest0-21swapper/021:19:070
1190299875,25cyclictest0-21swapper/122:28:011
1190299874,26cyclictest0-21swapper/120:28:381
1190299874,23cyclictest0-21swapper/122:22:451
1189799874,77cyclictest8985-21fschecks_count21:13:230
1189799874,76cyclictest0-21swapper/023:49:550
1189799874,76cyclictest0-21swapper/023:49:550
1189799874,76cyclictest0-21swapper/022:58:180
1189799874,76cyclictest0-21swapper/022:02:280
1189799873,77cyclictest23904-21ls22:23:130
1189799873,77cyclictest0-21swapper/021:23:140
1189799873,75cyclictest29282-21tail20:48:350
1190599863,75cyclictest5408-21diskstats22:43:163
1190299864,38cyclictest0-21swapper/123:13:321
1190299863,26cyclictest17330-21gltestperf23:48:171
1190299863,26cyclictest17330-21gltestperf23:48:171
11902998625,14cyclictest0-21swapper/120:38:041
1189799863,76cyclictest0-21swapper/022:53:520
1189799862,77cyclictest19057-21cpuspeed21:28:140
1189799862,76cyclictest7751-21ssh00:22:570
1190599853,74cyclictest0-21swapper/322:17:183
1190299855,35cyclictest0-21swapper/123:23:101
1190299855,16cyclictest21197-21sshd21:30:331
1190299855,10cyclictest16842-21taskset22:58:361
1190299854,24cyclictest0-21swapper/122:34:531
1190299853,33cyclictest0-21swapper/120:48:291
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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