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2025-04-03 - 16:11

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 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 Thu Apr 03, 2025 12:59:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
89129911671158,6cyclictest0-21swapper/107:25:091
89129911321120,8cyclictest25659-21memory08:05:201
88542570523,32sleep00-21swapper/007:24:580
87972562517,30sleep10-21swapper/107:24:241
891199135105,15cyclictest0-21swapper/007:25:090
53922840,9sleep0891199cyclictest10:20:200
8911998174,4cyclictest0-21swapper/008:05:200
26702660,3sleep12669-21sh10:14:591
148382426,31sleep12220-21dbus-daemon10:50:321
247982400,8sleep1891299cyclictest11:20:331
8911993716,7cyclictest18300-21awk11:00:270
63562362,4sleep00-21swapper/012:10:460
891199351,11cyclictest81rcu_preempt12:08:490
8911993510,13cyclictest3020-21runrttasks08:04:190
891199349,12cyclictest2220-21dbus-daemon10:05:370
891199345,15cyclictest22323-21kernelversion11:15:200
278172341,29sleep027839-21munin-run11:35:010
891199332,19cyclictest1249-21/usr/sbin/munin08:30:170
8911993312,7cyclictest3020-21runrttasks09:09:220
42592331,4sleep04268-21munin-run12:05:010
104212331,4sleep12220-21dbus-daemon12:23:501
891299326,4cyclictest81rcu_preempt08:31:201
891299325,4cyclictest81rcu_preempt07:34:441
891199323,15cyclictest0-21swapper/009:33:110
891199321,18cyclictest29552-21ntp_states08:15:250
86752321,5sleep00-21swapper/010:31:320
68032321,5sleep00-21swapper/010:26:340
323162321,5sleep00-21swapper/010:02:150
256992321,5sleep00-21swapper/011:27:260
201662321,27sleep120171-21ntp_states07:50:301
119832321,5sleep111986-21irqstats12:30:571
105252321,5sleep00-21swapper/010:36:140
104682321,9sleep10-21swapper/110:35:371
891299316,4cyclictest81rcu_preempt12:37:261
891299315,4cyclictest81rcu_preempt12:06:351
891199319,18cyclictest111rcuc/012:33:070
891199317,12cyclictest24679-21switchtime11:20:320
891199311,4cyclictest81rcu_preempt09:39:350
8911993113,5cyclictest27457-21/usr/sbin/munin08:10:250
891199311,12cyclictest0-21swapper/011:45:370
8911993110,5cyclictest3020-21runrttasks07:41:550
3222311,5sleep00-21swapper/008:28:200
206652311,26sleep120666-21ntp_states11:10:231
125402311,5sleep00-21swapper/010:42:280
109132311,5sleep00-21swapper/012:27:240
891299307,12cyclictest40950irq/93-i91508:50:111
891299304,4cyclictest81rcu_preempt09:04:211
8912993020,6cyclictest11870-21ntpq10:40:241
891299301,7cyclictest3011-21grep12:00:191
891299301,4cyclictest81rcu_preempt10:30:491
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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