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2026-01-08 - 20:47

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 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 Jan 08, 2026 12:59:03)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
117779912211180,20cyclictest19290-21smartctl07:40:261
117769911831151,27cyclictest0-21swapper/007:25:130
117779911461116,26cyclictest11941-21cut07:25:101
114342563518,30sleep10-21swapper/107:22:061
114112551483,53sleep00-21swapper/007:21:540
1177699187162,22cyclictest0-21swapper/007:40:270
320222820,2sleep032025-21grep11:05:300
304562590,4sleep130452-21wget10:30:091
177732560,4sleep01177699cyclictest09:41:340
21162540,4sleep1201rcuc/112:15:211
163482500,24sleep03-21ksoftirqd/011:23:200
170592490,8sleep11177799cyclictest07:35:191
7472440,8sleep01177699cyclictest12:14:270
11777994318,9cyclictest22-21ksoftirqd/111:54:491
1177699438,31cyclictest0-21swapper/012:45:560
11776994316,7cyclictest3-21ksoftirqd/012:15:500
1177799425,33cyclictest0-21swapper/109:22:161
11776994212,16cyclictest19462-21sh09:10:180
11776994122,4cyclictest3-21ksoftirqd/011:38:310
11776994121,5cyclictest3-21ksoftirqd/009:34:230
312372400,4sleep11177799cyclictest11:05:161
1177799409,27cyclictest0-21swapper/112:04:561
11777994031,5cyclictest0-21swapper/110:59:351
11776994024,5cyclictest3-21ksoftirqd/011:43:010
11776994023,6cyclictest3-21ksoftirqd/012:06:440
1177699401,7cyclictest7781-21/usr/sbin/munin10:40:270
11776994014,15cyclictest3-21ksoftirqd/009:51:530
1177799391,34cyclictest0-21swapper/110:05:351
11776993924,5cyclictest3-21ksoftirqd/011:28:580
11776993923,5cyclictest3-21ksoftirqd/010:01:490
11776993922,5cyclictest3-21ksoftirqd/011:51:420
11776993912,16cyclictest3-21ksoftirqd/010:58:220
11776993823,5cyclictest3-21ksoftirqd/012:37:030
11776993823,5cyclictest3-21ksoftirqd/011:45:470
11776993821,6cyclictest3-21ksoftirqd/011:17:140
11776993821,6cyclictest3-21ksoftirqd/010:07:440
11776993820,8cyclictest3-21ksoftirqd/009:36:170
11776993815,7cyclictest3-21ksoftirqd/009:25:130
23962371,32sleep12447-21/usr/sbin/munin08:25:211
1177799374,29cyclictest0-21swapper/109:43:351
11776993722,5cyclictest3-21ksoftirqd/011:11:020
11776993722,5cyclictest3-21ksoftirqd/010:26:580
11776993722,5cyclictest3-21ksoftirqd/010:24:260
11776993721,5cyclictest3-21ksoftirqd/009:59:540
11776993714,9cyclictest225622sleep012:03:040
11776993714,7cyclictest3-21ksoftirqd/010:51:160
11776993714,6cyclictest3-21ksoftirqd/010:15:090
105462371,4sleep110559-21sh10:42:231
1177799364,4cyclictest0-21swapper/107:55:161
1177799363,31cyclictest0-21swapper/110:21:361
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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