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2026-05-22 - 23:41

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, 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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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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rack7slot3s.osadl.org (updated Fri May 22, 2026 18:45:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2545221710,5sleep31976899cyclictest17:20:073
197659914839,87cyclictest31150-21unixbench_singl18:05:330
197659912829,77cyclictest0-21swapper/017:46:130
197659912641,63cyclictest28935-21Run17:57:520
197659912037,14cyclictest8050irq/56-dwc_otg_18:00:130
19767991177,10cyclictest30621-21context118:00:392
197659911021,63cyclictest28301-21sh18:11:060
2762421090,5sleep327620-21tee18:06:543
197659910625,55cyclictest20948-21sh17:40:470
197659910244,34cyclictest26958-21fstime17:52:130
854021000,7sleep28534-21sh17:40:192
197659910024,58cyclictest22504-21fschecks_count18:30:180
1705421000,1sleep30-21swapper/317:43:073
264642980,8sleep31976899cyclictest17:49:323
19765999828,56cyclictest4653-21grep17:37:550
264102930,4sleep126420-21spawn18:02:401
19765999233,26cyclictest0-21swapper/018:40:150
19765999223,49cyclictest0-21swapper/017:10:170
234072910,6sleep11976699cyclictest18:30:291
264822890,6sleep126443-21execl17:49:461
19765998919,59cyclictest0-21swapper/017:26:510
225952880,4sleep122585-21multi.sh18:06:441
119022870,1sleep30-21swapper/317:34:203
19765998625,51cyclictest25573-21taskset17:21:220
183072830,2sleep30-21swapper/317:00:203
183072830,2sleep30-21swapper/317:00:203
19765998038,10cyclictest19764-21cyclictest17:05:030
19765998024,39cyclictest0-21swapper/018:19:180
19765998024,39cyclictest0-21swapper/018:19:180
1976799795,44cyclictest301ktimersoftd/218:05:552
19765997737,22cyclictest20439-21apt-get18:25:110
19765997624,41cyclictest0-21swapper/017:19:180
19765997623,39cyclictest0-21swapper/018:38:300
175462740,6sleep21976799cyclictest17:38:462
19766997320,24cyclictest8050irq/56-dwc_otg_17:52:131
19765997228,24cyclictest19938-21taskset18:22:020
32132710,8sleep11976699cyclictest17:42:361
19768997118,27cyclictest8050irq/56-dwc_otg_18:00:273
19765997120,39cyclictest28427-21taskset17:32:240
61042700,4sleep16107-21multi.sh17:38:011
267682670,6sleep226504-21execl17:50:162
19767996621,29cyclictest24817-21aten_rbpower_vo17:45:162
1976899622,10cyclictest29300-21context117:59:593
1976699613,20cyclictest29088-21pipe17:58:431
1976799609,11cyclictest29297-21context117:59:582
267692590,2sleep326504-21execl17:50:173
255032540,2sleep10-21swapper/117:20:371
255452530,2sleep20-21swapper/217:21:022
19766995223,6cyclictest28035-21multi.sh18:11:061
1976699477,27cyclictest0-21swapper/117:15:161
19766994718,9cyclictest8050irq/56-dwc_otg_17:05:131
1976899461,37cyclictest27928-21wc18:11:053
1976799462,15cyclictest8050irq/56-dwc_otg_18:10:172
19767994611,7cyclictest7950irq/56-dwc_otg_17:20:022
191942453,34sleep00-21swapper/017:01:110
191942453,34sleep00-21swapper/017:01:110
1976899441,30cyclictest0-21swapper/317:38:173
1976699434,23cyclictest20427-21acpi18:25:111
1976699418,15cyclictest0-21swapper/117:27:191
19766993813,10cyclictest221ktimersoftd/117:10:201
1976899361,24cyclictest26141-21cut18:40:203
19767993612,4cyclictest29-21rcuc/217:25:092
1976699367,4cyclictest18615-21/usr/sbin/munin18:20:181
19768993512,5cyclictest7950irq/56-dwc_otg_17:15:023
1976799353,7cyclictest7950irq/56-dwc_otg_18:35:022
1976699354,19cyclictest7850irq/56-dwc_otg18:40:311
1976699351,12cyclictest0-21swapper/118:36:101
19766993511,10cyclictest221ktimersoftd/117:32:481
186772357,10sleep10-21swapper/117:00:271
186772357,10sleep10-21swapper/117:00:271
1976699344,14cyclictest17002-21sort18:15:171
1976699344,14cyclictest17002-21sort18:15:171
1976799332,17cyclictest8050irq/56-dwc_otg_18:40:302
1976799331,23cyclictest22181-21missed_timers17:10:232
1976799329,5cyclictest28538-21spawn17:33:152
1976799326,9cyclictest7950irq/56-dwc_otg_18:25:282
1976799323,5cyclictest0-21swapper/218:15:162
1976799323,5cyclictest0-21swapper/218:15:162
1976899313,5cyclictest7950irq/56-dwc_otg_18:15:163
1976899313,5cyclictest7950irq/56-dwc_otg_18:15:163
1976799317,4cyclictest0-21swapper/218:20:372
182102316,10sleep20-21swapper/217:00:202
182102316,10sleep20-21swapper/217:00:202
1976899302,4cyclictest23816-21idleruntime-cro18:35:023
19768993016,4cyclictest26584-21fschecks_time17:25:163
1976899294,5cyclictest25217-21cron17:20:023
19768992912,8cyclictest20126-21seq18:24:203
1976899291,14cyclictest0-21swapper/318:27:383
1976799296,4cyclictest7850irq/56-dwc_otg17:05:202
1976799281,11cyclictest25236-21users18:35:322
1976899271,19cyclictest0-21swapper/318:35:203
1976899271,17cyclictest20590-21ps17:05:263
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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