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2026-07-26 - 09:32

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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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 50 highest latencies:
System rack5slot4s.osadl.org (updated Sat Jul 25, 2026 12:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
123770099178158,18cyclictest1528204-21munin-run12:00:010
123770799151146,3cyclictest1528245-21gpgv12:00:012
149768721070,1chrt1497686-21/usr/sbin/munin11:27:511
13543652880,3sleep20-21swapper/209:07:382
1237703998884,3cyclictest0-21swapper/112:00:011
13986262750,3sleep01237695-21cyclictest09:50:010
12517882690,2sleep3481ktimers/307:22:433
13244052540,2sleep3481ktimers/308:35:013
1237703995140,9cyclictest278-21systemd-journal07:35:001
1237703994940,6cyclictest1279748-21latency_hist07:50:011
1237703994536,6cyclictest1393460-21latency_hist09:45:011
1237703994439,3cyclictest4083219-21kworker/u8:0+events_unbound07:55:001
1237700994230,9cyclictest278-21systemd-journal09:35:010
1237703994132,6cyclictest1367987-21ntpq09:17:521
1237703994132,6cyclictest1367987-21ntpq09:17:511
1237703993935,3cyclictest1403578-21kworker/u8:2+flush-8:010:17:421
1237700993934,4cyclictest427027-21kworker/u8:2+events_unbound08:12:510
1237703993834,3cyclictest1442451-21kworker/u8:0+flush-8:010:59:511
123770099380,15cyclictest0-21swapper/009:37:380
1237703993729,5cyclictest278-21systemd-journal08:31:511
1237700993729,5cyclictest1344005-21latency_hist08:55:010
12374142374,9sleep10-21swapper/107:08:301
1237707993632,3cyclictest1518222-21kworker/u8:3+events_unbound12:20:032
1237700993630,4cyclictest1403578-21kworker/u8:2+flush-8:010:42:450
1237703993530,4cyclictest1503379-21kworker/u8:2+flush-8:012:32:471
1237703993530,3cyclictest1244343-21irqrtprio07:15:041
1237703993524,9cyclictest1258932-21ntpq07:27:501
1237700993530,3cyclictest1473359-21systemd-run11:05:000
1237700993530,3cyclictest1295210-21cpuspeed_turbos08:07:380
123770099349,12cyclictest1540362-21cat12:12:460
1237700993429,3cyclictest1305061-21tr08:17:410
1237700993427,5cyclictest1513991-21diskstats11:47:410
1237700993427,5cyclictest1513991-21diskstats11:47:410
1237700993412,20cyclictest1227819-21kworker/0:1+events07:32:450
123770099340,33cyclictest1447600-21sshd10:37:510
12373952344,10sleep20-21swapper/207:08:142
1237707993329,3cyclictest4083219-21kworker/u8:0+events_unbound09:22:572
123770099339,9cyclictest0-21swapper/007:52:540
123770799327,11cyclictest1473331-21idleruntime-cro11:05:002
1237707993221,8cyclictest1398488-21cp09:50:012
1237707993216,4cyclictest39-21ksoftirqd/210:17:392
1237703993223,7cyclictest1443099-21apt-get10:35:001
1237700993223,7cyclictest1349695-21diskstats09:02:390
1237700993212,11cyclictest0-21swapper/010:08:580
128865423117,9sleep30-21swapper/307:57:473
1237707993122,2cyclictest161rcu_preempt09:52:462
1237707993112,3cyclictest39-21ksoftirqd/208:32:402
1237703993126,4cyclictest1498149-21kworker/u8:0+flush-8:011:42:561
1237703993125,4cyclictest1260057-21kworker/u8:3+flush-8:008:27:441
1237703993125,4cyclictest1260057-21kworker/u8:3+events_unbound08:57:521
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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