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2026-06-02 - 05:36

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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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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 rack5slot3s.osadl.org (updated Tue Jun 02, 2026 00:44:28)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
6872239161,24sleep00-21swapper/019:09:390
5662237163,23sleep20-21swapper/219:08:112
4752222153,57sleep30-21swapper/319:07:043
3512204167,24sleep10-21swapper/119:05:331
1351221870,4sleep385699cyclictest19:35:183
2575021410,4sleep285299cyclictest22:30:172
104222670,1sleep10-21swapper/119:30:011
210122590,3sleep083699cyclictest23:35:000
171712500,4sleep3401ktimersoftd/300:39:213
139142490,1sleep30-21swapper/320:50:143
856993927,6cyclictest0-21swapper/323:28:413
852993913,23cyclictest25963-21/usr/sbin/munin20:05:182
85299381,28cyclictest0-21swapper/223:20:312
83699389,13cyclictest14758-21basename19:40:010
856993726,3cyclictest0-21swapper/319:20:013
85699371,21cyclictest0-21swapper/321:23:093
83699378,13cyclictest13794-21munin-run22:05:010
83699376,15cyclictest18802-21munin-run23:30:000
85699351,15cyclictest0-21swapper/321:27:173
85299355,4cyclictest23877-40dnf22:25:252
85299351,5cyclictest21221-21/usr/sbin/munin23:35:182
85299351,5cyclictest21221-21/usr/sbin/munin23:35:182
85299351,27cyclictest0-21swapper/200:25:112
856993417,8cyclictest0-21swapper/300:02:493
85699341,21cyclictest14828-21irqstats22:05:173
85699341,21cyclictest0-21swapper/319:11:083
852993413,18cyclictest3980-21/usr/sbin/munin19:15:232
852993410,3cyclictest8053-21smart_sda20:35:252
85299334,3cyclictest87350irq/126-enp1s0-21:20:022
85299331,5cyclictest736-21/usr/sbin/munin21:35:232
85299331,5cyclictest30013-21/usr/sbin/munin23:55:272
852993310,4cyclictest0-21swapper/223:30:162
852993310,2cyclictest15589-21/usr/sbin/munin20:55:182
83699338,12cyclictest17248-21awk00:40:010
85699321,25cyclictest0-21swapper/323:42:333
85699320,26cyclictest0-21swapper/321:38:113
85299329,3cyclictest30978-21/usr/sbin/munin21:30:242
85299328,3cyclictest8988-21/usr/sbin/munin20:40:152
85299327,4cyclictest19812-21/usr/sbin/munin22:15:252
85299321,16cyclictest0-21swapper/221:57:342
85299321,15cyclictest0-21swapper/221:48:512
85299321,14cyclictest0-21swapper/220:01:552
852993211,3cyclictest27901-21cat21:20:252
852993211,2cyclictest2073-21/usr/sbin/munin00:05:162
852993210,2cyclictest30357-21/usr/sbin/munin20:15:232
852993210,19cyclictest8671-21/usr/sbin/munin00:20:242
85699311,23cyclictest0-21swapper/300:26:473
85699311,21cyclictest0-21swapper/320:56:213
85699311,12cyclictest0-21swapper/322:53:443
85699310,24cyclictest0-21swapper/319:59:453
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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