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2026-10-11 - 15:47

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #9, 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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Click here to display the system's profile data or here to proceed to next system.
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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack9slot4s (updated Sat Sep 26, 2026 00:59:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
311719911231102,17cyclictest31608-21diskstats19:25:141
308552586539,32sleep00-21swapper/019:22:130
310062487443,29sleep10-21swapper/119:23:511
3117099125114,8cyclictest0-21swapper/019:25:140
153862980,5sleep041ktimersoftd/020:05:210
121452850,9sleep13117199cyclictest19:55:281
45232760,3sleep0111rcuc/023:55:150
3117199638,6cyclictest0-21swapper/120:09:091
31171996014,7cyclictest22-21ksoftirqd/122:40:201
31171995011,9cyclictest16948-21fschecks_time20:10:161
31171994410,6cyclictest22-21ksoftirqd/121:32:071
31171994016,8cyclictest22-21ksoftirqd/121:14:321
3117099406,14cyclictest2225-21dbus-daemon20:55:330
240172400,2sleep024015-21cat20:30:010
6622391,4sleep0757-21aten_r4power_vo22:20:110
31171993916,7cyclictest22-21ksoftirqd/121:52:511
31171993817,7cyclictest22-21ksoftirqd/121:01:591
31171993816,7cyclictest22-21ksoftirqd/121:58:581
31171993811,8cyclictest1100-21aten_r4power_vo20:55:131
31170993812,7cyclictest13692-21/usr/sbin/munin21:25:290
258892381,32sleep025899-21/usr/sbin/munin22:00:150
31171993715,7cyclictest22-21ksoftirqd/120:36:411
3117099372,15cyclictest20792-21perl20:20:170
3117099372,14cyclictest30930-21taskset22:13:420
3117099371,17cyclictest4564-21grep19:35:270
3117099371,15cyclictest22058-21taskset21:50:130
31170993711,11cyclictest12455-21fschecks_time22:50:150
31171993615,7cyclictest22-21ksoftirqd/122:28:461
31171993614,7cyclictest22-21ksoftirqd/121:18:001
3117099362,6cyclictest3286-21runrttasks23:02:360
3117099362,14cyclictest26806-21taskset23:28:360
3117099362,14cyclictest2355-21plymouth19:30:270
3117099361,16cyclictest27434-21taskset20:37:490
3117099361,14cyclictest23425-21cut23:20:110
31170993610,6cyclictest28753-21runrttasks23:34:200
31171993513,8cyclictest22-21ksoftirqd/119:39:541
31171993512,12cyclictest5176-21df21:05:141
31171993511,7cyclictest5040-21which22:30:221
3117099351,29cyclictest10111-21diskstats00:10:150
3117099351,15cyclictest96042chrt22:40:450
3117099351,14cyclictest16840-21taskset00:26:300
3117199348,9cyclictest2225-21dbus-daemon22:36:381
3117199341,8cyclictest22185-21/usr/sbin/munin20:25:171
31171993412,7cyclictest22-21ksoftirqd/123:54:421
3117099341,15cyclictest13878-21chrt00:20:120
3117099341,13cyclictest31288-21grep23:40:150
240842341,29sleep123352-21/usr/sbin/munin23:20:221
3117199331,10cyclictest10735-21munin-run19:54:591
3117099331,6cyclictest743-21chrt23:45:170
3117099331,27cyclictest3810-21ntp_kernel_err21:00:250
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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