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2025-12-09 - 01:16

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 Mon Dec 08, 2025 12:43:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
26296212096,18sleep20-21swapper/207:05:282
26442211796,15sleep30-21swapper/307:07:213
26604211695,16sleep00-21swapper/007:09:270
26646211396,12sleep10-21swapper/107:09:561
179712800,1sleep00-21swapper/009:50:590
115322540,0sleep00-21swapper/009:45:120
26679992320,2cyclictest1742-21kworker/u8:209:36:062
2667999230,18cyclictest0-21swapper/211:51:052
26679992219,2cyclictest6293-21kworker/u8:107:59:052
26679992219,2cyclictest6293-21kworker/u8:107:59:042
26679992219,2cyclictest6293-21kworker/u8:107:42:012
26679992219,2cyclictest32674-21kworker/u8:009:09:042
26679992219,2cyclictest28469-21kworker/u8:307:35:052
26679992219,2cyclictest28469-21kworker/u8:307:31:042
26679992219,2cyclictest22556-21kworker/u8:008:16:052
26679992219,2cyclictest19899-21kworker/u8:212:18:062
26679992219,2cyclictest18072-21kworker/u8:209:52:062
26679992219,2cyclictest12756-21kworker/u8:008:03:052
26679992219,2cyclictest12756-21kworker/u8:008:03:042
26679992219,2cyclictest11695-21kworker/u8:210:32:062
26679992218,2cyclictest11629-21kworker/u8:009:55:042
2667999220,17cyclictest0-21swapper/211:46:012
2667999220,17cyclictest0-21swapper/208:57:042
2667799220,3cyclictest27907-21latency08:30:190
2667799220,2cyclictest0-21swapper/010:38:250
2667799220,20cyclictest28990-21ssh11:47:320
2667799220,13cyclictest10547-21taskset09:44:040
26680992118,2cyclictest386-21kworker/u8:010:14:043
26680992118,2cyclictest32674-21kworker/u8:009:10:053
2667999212,2cyclictest0-21swapper/210:48:042
26679992118,2cyclictest6293-21kworker/u8:108:39:052
26679992118,2cyclictest6293-21kworker/u8:108:25:052
26679992118,2cyclictest6268-21kworker/u8:110:16:052
26679992118,2cyclictest4311-21kworker/u8:109:04:052
26679992118,2cyclictest32674-21kworker/u8:008:49:042
26679992118,2cyclictest32674-21kworker/u8:008:44:052
26679992118,2cyclictest28469-21kworker/u8:307:29:052
26679992118,2cyclictest26750-21kworker/u8:007:20:052
26679992118,2cyclictest23581-21kworker/u8:209:26:052
26679992118,2cyclictest19899-21kworker/u8:212:22:052
26679992118,2cyclictest18310-21kworker/u8:011:02:052
26679992118,2cyclictest18256-21kworker/u8:109:22:042
26679992118,2cyclictest18072-21kworker/u8:210:01:052
26679992118,2cyclictest1742-21kworker/u8:209:43:052
26679992118,2cyclictest15928-21kworker/u8:111:42:052
2667999210,4cyclictest31-21ksoftirqd/211:37:042
2667999210,17cyclictest0-21swapper/209:16:022
2667999210,16cyclictest0-21swapper/212:09:052
26678992118,2cyclictest2277-21kworker/u8:112:33:051
26678992118,2cyclictest19899-21kworker/u8:212:24:051
2667799210,3cyclictest0-21swapper/008:35:100
26680992017,2cyclictest32674-21kworker/u8:009:33:043
2668099200,18cyclictest0-21swapper/312:33:053
2667999202,2cyclictest0-21swapper/210:53:052
26679992017,2cyclictest9654-21kworker/u8:211:27:042
26679992017,2cyclictest6836-21kworker/u8:111:59:052
26679992017,2cyclictest28294-21kworker/u8:109:47:042
26679992017,2cyclictest26445-21kworker/u8:012:26:042
2667999201,2cyclictest0-21swapper/212:04:042
2667999201,2cyclictest0-21swapper/210:27:052
2667999200,18cyclictest0-21swapper/210:55:052
2667999200,15cyclictest0-21swapper/208:11:052
2667799200,2cyclictest0-21swapper/011:28:170
26680991916,2cyclictest15928-21kworker/u8:111:45:043
2667999192,9cyclictest0-21swapper/211:08:052
2667999191,2cyclictest0-21swapper/207:19:042
26677991910,7cyclictest25992-21ssh09:25:200
2667799190,2cyclictest0-21swapper/011:32:520
2667799190,17cyclictest10777-21diskmemload12:00:220
2667799190,11cyclictest0-21swapper/010:46:210
2667799190,11cyclictest0-21swapper/009:18:260
112202190,0sleep30-21swapper/311:28:543
26680991815,2cyclictest26445-21kworker/u8:012:23:043
26680991815,2cyclictest11695-21kworker/u8:210:32:013
26680991815,2cyclictest11629-21kworker/u8:009:46:013
26679991815,2cyclictest20276-21kworker/u8:107:10:062
2667999181,2cyclictest0-21swapper/211:10:012
2667999180,2cyclictest0-21swapper/212:38:042
2667999180,2cyclictest0-21swapper/209:34:042
2667999180,2cyclictest0-21swapper/209:11:042
26678991815,2cyclictest15928-21kworker/u8:111:48:051
2667799187,2cyclictest0-21swapper/009:21:570
2667799180,2cyclictest0-21swapper/012:34:240
2667799180,2cyclictest0-21swapper/011:50:280
2667799180,2cyclictest0-21swapper/010:10:300
2667799180,1cyclictest0-21swapper/012:08:390
2667799180,16cyclictest0-21swapper/011:08:540
2667799180,11cyclictest10777-21diskmemload11:38:010
2667799180,11cyclictest0-21swapper/012:20:570
309992170,0sleep30-21swapper/310:05:203
26680991714,2cyclictest9654-21kworker/u8:211:33:053
26680991714,2cyclictest6268-21kworker/u8:110:47:043
26680991714,2cyclictest386-21kworker/u8:010:18:053
26680991714,2cyclictest16736-21kworker/u8:208:07:043
26680991714,2cyclictest12632-21kworker/u8:012:07:053
26680991714,2cyclictest11695-21kworker/u8:210:26:053
26680991714,2cyclictest11283-21kworker/u8:209:16:063
26680991714,2cyclictest0-21swapper/312:27:483
2667999170,2cyclictest0-21swapper/210:11:042
2667999170,2cyclictest0-21swapper/210:07:052
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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