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2026-08-24 - 01:49

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #4

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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack5slot4s.osadl.org (updated Sun Aug 23, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
129044021900,2sleep3575-21kworker/3:2-events09:42:433
11791642660,2sleep3575-21kworker/3:2+events07:47:503
11791642660,2sleep3575-21kworker/3:2+events07:47:503
11608212650,1sleep3471rcuc/307:32:413
1137786996240,19cyclictest1154723-21latency_hist07:25:010
1137786995851,5cyclictest1179725-21latency_hist07:50:000
1137786995851,5cyclictest1179725-21latency_hist07:50:000
1137786995531,21cyclictest1159636-21latency_hist07:30:010
11349222540,9chrt13-21ksoftirqd/007:07:420
1137786995343,8cyclictest1467017-21latency_hist12:40:010
1137790995040,7cyclictest1323335-21latency_hist10:15:011
1137790994739,5cyclictest1288714-21latency_hist09:40:011
1137790994737,7cyclictest1363110-21latency_hist10:55:011
1137790994636,8cyclictest1179008-21ntpq07:47:461
1137790994636,8cyclictest1179008-21ntpq07:47:461
1137790994433,9cyclictest1367341-21ntpq10:57:491
1137786994419,10cyclictest275-21systemd-journal11:00:000
1137790994331,8cyclictest275-21systemd-journal12:32:391
1137786994334,6cyclictest1437309-21latency_hist12:10:010
1137786994317,23cyclictest0-21swapper/010:52:340
12547592420,3sleep01137778-21cyclictest09:07:370
1137790994233,7cyclictest1273122-21ntpq09:22:501
1137790994232,7cyclictest1407605-21latency_hist11:40:011
1137786994221,19cyclictest1299419-21fschecks_time09:52:410
1137795994122,17cyclictest275-21systemd-journal12:20:002
1137790994135,4cyclictest1308538-21kworker/u8:2+flush-8:010:42:531
1137786994021,17cyclictest275-21systemd-journal12:24:370
1137786994020,18cyclictest1264951-21sort09:17:420
1137786993931,6cyclictest1209795-21/usr/sbin/munin08:22:470
1137786993922,15cyclictest1229151-21apt-key08:40:000
1137786993921,16cyclictest0-21swapper/008:45:010
1137786993920,17cyclictest1349261-21sort10:42:410
1137786993919,2cyclictest0-21swapper/010:35:010
1137786993914,6cyclictest1223944-21unixbench_singl08:32:520
1137795993821,2cyclictest1234855-21aten2_r5power_v08:47:372
113779599381,8cyclictest11608252sed07:32:412
1137790993827,8cyclictest1343120-21latency_hist10:35:011
1137786993831,5cyclictest1189383-21grep07:57:540
1137786993821,16cyclictest1332995-21unixbench_singl10:22:550
1137786993821,15cyclictest1443283-21sort12:17:410
1137786993821,15cyclictest0-21swapper/007:17:340
1137786993819,2cyclictest0-21swapper/007:42:430
1137786993818,3cyclictest0-21swapper/007:32:450
113779599379,10cyclictest1209820-21apt-get08:22:362
1137795993722,13cyclictest1205083-21cpuspeed_turbos08:17:372
1137790993732,3cyclictest1100263-21kworker/u8:2+events_unbound08:27:391
1137786993720,2cyclictest1382624-21unixbench_multi11:12:540
1137786993718,2cyclictest0-21swapper/010:47:450
1137786993717,2cyclictest0-21swapper/009:15:000
1137786993716,3cyclictest0-21swapper/012:00:000
1137786993716,3cyclictest0-21swapper/012:00:000
1137786993714,6cyclictest1387826-21latency_hist11:20:010
1137786993711,22cyclictest1169511-21kworker/0:1+events07:52:360
1137795993629,5cyclictest1100263-21kworker/u8:2+flush-8:009:02:522
1137790993629,5cyclictest1466754-21grep12:37:551
1137786993627,7cyclictest1219235-21latency_hist08:30:010
1137786993622,12cyclictest850-21mta-sts-daemon12:31:300
1137786993615,4cyclictest1286743-21kthreadcore09:37:440
113779599352,13cyclictest1190062-21apt-get08:02:362
113778699353,9cyclictest0-21swapper/008:52:070
1137786993529,4cyclictest1397712-21unin-run11:30:000
113778699352,14cyclictest573-21runrttasks11:02:350
1137786993518,2cyclictest0-21swapper/009:02:440
1137790993427,5cyclictest1110255-21kworker/u8:3+flush-8:008:32:371
1137790993426,5cyclictest275-21systemd-journal07:10:331
1137786993417,3cyclictest0-21swapper/008:57:440
1137786993416,16cyclictest0-21swapper/010:37:440
1137786993415,4cyclictest1377939-21cron11:10:000
1137786993414,3cyclictest0-21swapper/009:32:390
113778699341,32cyclictest1204448-21kworker/0:2+events08:16:360
1137795993323,8cyclictest1348277-21/usr/sbin/munin10:40:012
1137790993327,4cyclictest1413023-21apt-get11:47:351
1137790993327,4cyclictest1259031-21kworker/u8:3+flush-8:010:50:011
1137790993327,4cyclictest1259031-21kworker/u8:3+flush-8:010:17:421
1137790993327,4cyclictest1100263-21kworker/u8:2+flush-8:009:27:391
1137790993326,5cyclictest275-21systemd-journal08:23:341
113778699332,9cyclictest0-21swapper/009:58:160
113778699332,9cyclictest0-21swapper/009:58:160
1137786993328,4cyclictest1259031-21kworker/u8:3+flush-8:010:02:550
1137786993324,6cyclictest1328251-21latency_hist10:20:010
11482492320,5sleep30-21swapper/307:17:443
1137790993227,3cyclictest1457116-21systemd-run12:30:011
1137790993226,4cyclictest1442261-21kworker/u8:1+events_unbound12:17:431
1137790993226,4cyclictest1279290-21apt-get09:32:341
1137790993226,4cyclictest1158930-21ntpq07:27:501
1137790993226,4cyclictest1110255-21kworker/u8:3+flush-8:008:47:391
1137790993223,7cyclictest1292923-21ntpq09:42:471
1137790993222,8cyclictest1307732-21ntpq09:57:481
1137790993222,8cyclictest1307732-21ntpq09:57:481
1137790993222,7cyclictest1382885-21latency_hist11:15:011
1137790993221,8cyclictest275-21systemd-journal10:25:331
113778699327,10cyclictest1401882-21grep11:32:470
1137786993210,2cyclictest0-21swapper/011:45:430
1137790993127,2cyclictest849-21mta-sts-daemon08:00:001
1137790993126,3cyclictest1348262-21awk10:40:001
1137786993114,4cyclictest0-21swapper/009:22:380
1137795993019,4cyclictest1343142-21gpgv10:35:002
1137790993026,3cyclictest1249162-21systemd-run09:00:001
1137790993026,2cyclictest1428088-21cpuspeed_turbos12:02:361
1137790993025,4cyclictest1100263-21kworker/u8:2+events_unbound08:37:541
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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