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2025-12-04 - 09:11

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #6

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
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack3slot6s.osadl.org (updated Thu Dec 04, 2025 00:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29559211895,18sleep30-21swapper/319:07:383
29732211695,16sleep00-21swapper/019:09:510
296282114103,6sleep10-21swapper/119:08:321
29454210580,19sleep20-21swapper/219:06:172
135692810,1sleep0101ktimersoftd/022:52:590
104432770,1sleep2301ktimersoftd/200:34:002
112402530,1sleep337-21rcuc/322:15:263
2977399230,22cyclictest0-21swapper/319:15:033
304952220,0sleep00-21swapper/023:45:190
2977399221,19cyclictest13717-21diskmemload23:20:123
2977299210,5cyclictest31-21ksoftirqd/222:06:042
2977399202,1cyclictest0-21swapper/323:45:113
29773992015,3cyclictest15743-21ssh00:05:153
2977299200,18cyclictest0-21swapper/222:35:132
29771992017,2cyclictest9912-21kworker/u8:021:07:041
29771992017,2cyclictest22567-21kworker/u8:221:24:061
315642180,0sleep20-21swapper/222:03:112
29772991814,3cyclictest31-21ksoftirqd/200:35:142
29771991815,2cyclictest22089-21kworker/u8:220:32:041
29771991815,2cyclictest20242-21kworker/u8:123:53:041
29771991815,2cyclictest17286-21kworker/u8:121:52:051
29771991815,2cyclictest16041-21kworker/u8:219:59:041
29771991815,2cyclictest14452-21kworker/u8:219:27:051
29771991815,2cyclictest10151-21kworker/u8:222:17:041
2977199172,2cyclictest0-21swapper/123:25:041
29771991714,2cyclictest28764-21kworker/u8:122:42:051
29771991714,2cyclictest27499-21kworker/u8:023:43:041
29771991714,2cyclictest14205-21kworker/u8:121:16:041
2977399162,12cyclictest381ktimersoftd/300:34:203
2977399161,13cyclictest0-21swapper/321:59:513
2977399161,13cyclictest0-21swapper/300:25:173
2977299160,14cyclictest0-21swapper/223:40:232
29771991613,2cyclictest9519-21kworker/u8:219:43:041
29771991613,2cyclictest28051-21kworker/u8:021:26:041
29771991613,2cyclictest27067-21kworker/u8:023:21:051
29771991613,2cyclictest20242-21kworker/u8:100:12:061
29771991613,2cyclictest14205-21kworker/u8:121:38:051
29770991611,3cyclictest0-21swapper/020:00:000
95572150,0sleep10-21swapper/119:38:371
305382150,1sleep1221ktimersoftd/122:01:301
2977399151,12cyclictest13717-21diskmemload00:03:583
2977399151,12cyclictest0-21swapper/300:20:383
29773991510,3cyclictest24047-21ssh22:30:113
2977399150,4cyclictest0-21swapper/322:02:583
29772991511,2cyclictest13717-21diskmemload23:55:132
2977299150,3cyclictest3544-21ssh00:25:322
2977299150,13cyclictest0-21swapper/222:34:522
29771991512,2cyclictest8390-21kworker/u8:223:34:051
29771991512,2cyclictest28764-21kworker/u8:122:48:021
29771991512,2cyclictest28764-21kworker/u8:122:48:011
29771991512,2cyclictest19782-21kworker/u8:223:01:041
29771991512,2cyclictest10151-21kworker/u8:222:38:021
29771991510,3cyclictest0-21swapper/100:22:221
2977099151,12cyclictest13717-21diskmemload21:19:390
29770991510,3cyclictest27320-21ssh21:58:540
2977099150,2cyclictest0-21swapper/022:45:120
2977099150,2cyclictest0-21swapper/022:45:110
2977399149,3cyclictest18982-21seq21:50:103
2977399142,7cyclictest0-21swapper/323:05:003
2977399141,2cyclictest381ktimersoftd/322:20:123
29773991411,2cyclictest39-21ksoftirqd/321:34:493
29773991410,2cyclictest0-21swapper/319:50:113
2977399140,12cyclictest381ktimersoftd/323:52:573
2977399140,12cyclictest0-21swapper/323:06:003
2977399140,12cyclictest0-21swapper/321:43:203
2977399140,12cyclictest0-21swapper/300:15:483
2977299149,3cyclictest1370-21ssh22:40:122
2977299144,6cyclictest272422cat20:20:282
29772991411,2cyclictest0-21swapper/223:13:322
29772991411,2cyclictest0-21swapper/221:28:432
2977299140,2cyclictest1598-21munin-node2
2977299140,2cyclictest0-21swapper/221:32:132
2977299140,2cyclictest0-21swapper/221:12:442
2977299140,2cyclictest0-21swapper/200:03:222
2977299140,13cyclictest0-21swapper/223:16:122
2977299140,13cyclictest0-21swapper/221:20:442
2977299140,12cyclictest22265-21ssh23:36:242
2977299140,12cyclictest1092-21kworker/2:021:38:312
2977299140,12cyclictest0-21swapper/223:26:112
2977199146,5cyclictest0-21swapper/120:55:591
29771991411,2cyclictest9791-21kworker/u8:021:43:041
29771991411,2cyclictest0-21swapper/121:32:261
29771991411,2cyclictest0-21swapper/119:30:171
2977199140,12cyclictest0-21swapper/122:53:061
2977199140,12cyclictest0-21swapper/121:56:021
2977199140,12cyclictest0-21swapper/120:05:011
2977199140,12cyclictest0-21swapper/100:27:421
2977199140,12cyclictest0-21swapper/100:16:211
2977199140,12cyclictest0-21swapper/100:05:281
2977099142,7cyclictest0-21swapper/022:15:010
2977099141,7cyclictest11740-21copy21:05:010
2977099141,11cyclictest13717-21diskmemload23:27:200
29770991410,2cyclictest0-21swapper/022:31:080
2977099140,3cyclictest8092-21ssh21:37:580
2977099140,3cyclictest4616-21ssh22:09:310
2977099140,12cyclictest31944-21ssh22:38:080
2977099140,12cyclictest0-21swapper/023:41:440
2977099140,12cyclictest0-21swapper/023:06:550
2977099140,12cyclictest0-21swapper/023:00:160
2977099140,12cyclictest0-21swapper/022:40:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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