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2026-04-18 - 20:31

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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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Data to construct the above plot have been generated using the RT test utility cyclictest.

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 rackeslot6s.osadl.org (updated Sat Apr 18, 2026 12:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
79739199791,42cyclictest0-21swapper/212:10:192
797388997568,5cyclictest0-21swapper/108:30:011
797387996759,5cyclictest131ktimers/007:20:010
79739199652,55cyclictest837986-21apt-get11:05:172
797391996127,29cyclictest0-21swapper/212:15:272
797391996120,32cyclictest0-21swapper/208:35:202
797391996115,38cyclictest0-21swapper/209:55:282
79738799615,20cyclictest813010-21apt-get08:40:020
79738799595,9cyclictest14-21rcu_preempt08:15:010
79739199578,43cyclictest852425-21/usr/sbin/munin12:30:192
797391995725,26cyclictest0-21swapper/208:20:272
797391995725,26cyclictest0-21swapper/208:20:272
797391995722,29cyclictest837745-21grep11:00:292
797391995722,28cyclictest0-21swapper/209:50:292
79739199562,46cyclictest851585-21apt-get12:25:162
79739199562,45cyclictest832071-21/usr/sbin/munin10:30:292
79739199562,45cyclictest832071-21/usr/sbin/munin10:30:292
79738799561,53cyclictest0-21swapper/012:20:010
797391995516,30cyclictest0-21swapper/210:25:232
79738799554,13cyclictest805322-21apt-get07:55:020
79739199548,38cyclictest0-21swapper/210:00:272
797391995428,21cyclictest0-21swapper/207:35:012
797391995427,21cyclictest0-21swapper/209:40:212
797391995416,33cyclictest0-21swapper/210:45:102
797391995414,34cyclictest805447-21latency_hist07:55:002
797388995414,8cyclictest838821-21/usr/sbin/munin11:10:191
797388995414,8cyclictest838821-21/usr/sbin/munin11:10:191
797387995445,5cyclictest0-21swapper/010:45:150
79739199533,3cyclictest836740-21/usr/sbin/munin10:55:292
797391995325,21cyclictest0-21swapper/211:40:262
797391995316,29cyclictest0-21swapper/211:55:222
797391995316,29cyclictest0-21swapper/208:30:292
79739199531,5cyclictest830306-21apt-get10:20:152
79739199531,4cyclictest833769-21/usr/sbin/munin10:40:282
79739199531,12cyclictest821845-21apt-get09:30:152
79739199523,6cyclictest803772-21latency_hist07:45:022
79739199523,39cyclictest829122-21grep10:10:282
79739199521,8cyclictest798830-21/usr/sbin/munin07:15:182
797391995216,28cyclictest0-21swapper/208:15:292
797391995212,31cyclictest0-21swapper/207:35:292
79739199521,12cyclictest841366-21apt-get11:25:152
79739199521,10cyclictest845578-21/usr/sbin/munin11:50:292
79739199521,10cyclictest845578-21/usr/sbin/munin11:50:292
79739199514,38cyclictest0-21swapper/208:00:202
79739199512,42cyclictest853372-21/usr/sbin/munin12:35:202
79739199512,40cyclictest823254-21head09:35:302
79739199512,40cyclictest823254-21head09:35:302
79739199512,39cyclictest824797-21ptp4l09:45:372
79739199511,9cyclictest806356-21latency_hist08:00:012
797391995117,28cyclictest0-21swapper/210:05:182
79739199511,4cyclictest797603-21/usr/sbin/munin07:10:152
797391995114,29cyclictest0-21swapper/210:35:292
797388995134,10cyclictest231ktimers/109:05:121
797388995123,17cyclictest22-21rcuc/112:25:011
79739199509,34cyclictest0-21swapper/209:05:012
79739199509,32cyclictest0-21swapper/210:50:282
79739199508,35cyclictest0-21swapper/209:25:272
79739199506,35cyclictest845272-21grep11:45:282
79739199505,36cyclictest815691-21grep08:50:292
79739199503,39cyclictest0-21swapper/208:40:192
79739199502,4cyclictest840527-21apt-get11:20:152
79739199502,37cyclictest842365-21sh11:30:172
79739199502,12cyclictest848664-21grep12:05:302
79739199501,8cyclictest843517-21grep11:35:272
79739199501,10cyclictest820164-21apt-get09:20:152
797391995010,33cyclictest839405-21unixbench_singl11:10:282
797391995010,33cyclictest839405-21unixbench_singl11:10:282
79739199499,31cyclictest0-21swapper/212:00:282
79739199497,35cyclictest851163-21ptp4l12:20:262
79739199492,5cyclictest817724-21sh09:05:202
79739199492,38cyclictest804435-21grep07:45:292
79739199491,9cyclictest816487-21/usr/sbin/munin08:55:292
797391994918,26cyclictest0-21swapper/210:15:202
797391994918,26cyclictest0-21swapper/210:15:202
79739199491,4cyclictest814407-21/usr/sbin/munin08:45:242
79739199491,40cyclictest808154-21apt-get08:10:162
79739199483,36cyclictest810792-21sh08:25:202
79739199482,7cyclictest800543-21diskstats07:25:202
79739199482,3cyclictest799709-21/usr/sbin/munin07:20:202
79739199482,38cyclictest819467-21tune2fs09:15:212
79739199482,37cyclictest840310-21munin-run11:20:002
797387994840,6cyclictest839463-21munin-plugin-st11:15:000
797387994840,6cyclictest839463-21munin-plugin-st11:14:590
79739199473,35cyclictest0-21swapper/209:15:012
79739199473,35cyclictest0-21swapper/209:15:002
79739199471,10cyclictest807512-21sh08:05:232
797388994736,6cyclictest837778-21cron11:05:001
797388994632,9cyclictest801021-21grep07:25:291
797388994632,8cyclictest809580-21grep08:15:301
797387994637,6cyclictest801950-21munin-plugin-st07:34:590
79738799456,6cyclictest849592-21apt-get12:15:010
797387994533,9cyclictest0-21swapper/008:50:020
797388994432,6cyclictest0-21swapper/108:45:171
797388994429,10cyclictest0-21swapper/112:10:281
797387994428,10cyclictest0-21swapper/009:40:260
797388994333,4cyclictest0-21swapper/109:45:391
797388994331,6cyclictest0-21swapper/109:45:001
797388994330,8cyclictest0-21swapper/107:10:281
79738899431,9cyclictest0-21swapper/110:10:021
79738899431,7cyclictest0-21swapper/112:20:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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