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2026-09-04 - 11:01

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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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.

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 Fri Sep 04, 2026 00:44:47)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
137510799110102,5cyclictest231ktimers/119:25:011
1375105999011,18cyclictest1412872-21apt-get22:50:010
1375105998480,2cyclictest0-21swapper/021:00:010
1375105997727,14cyclictest0-21swapper/021:20:130
1375105997239,4cyclictest167350irq/118-8000000.ethernet-tx022:20:170
137510599721,8cyclictest1401059-21wc21:40:010
1375107996742,20cyclictest231ktimers/123:50:021
137510599658,25cyclictest20850irq/208-8000000.ethernet20:20:010
137510599593,14cyclictest1393158-21kworker/u8:4+ext4-rsv-conversion21:15:010
1375105995848,5cyclictest167350irq/118-8000000.ethernet-tx021:30:010
1375105995848,5cyclictest167350irq/118-8000000.ethernet-tx021:30:000
1375105995737,16cyclictest167350irq/118-8000000.ethernet-tx021:30:340
1375109995447,4cyclictest1411184-21sendmail22:40:002
137510999544,24cyclictest30-21rcuc/200:05:192
1375107995414,9cyclictest0-21swapper/119:30:021
137510799515,25cyclictest22-21rcuc/100:15:001
1375107995143,5cyclictest832-21systemd-network22:50:051
137510599506,14cyclictest131ktimers/022:10:010
1375109994926,12cyclictest14-21rcu_preempt19:35:012
1375109994926,12cyclictest14-21rcu_preempt19:35:012
1375107994928,18cyclictest1400313-21/usr/sbin/munin21:35:191
137510599486,5cyclictest0-21swapper/021:10:010
1375105994840,4cyclictest167350irq/118-8000000.ethernet-tx019:25:290
1375109994735,8cyclictest0-21swapper/222:50:012
1375109994733,11cyclictest311ktimers/219:50:142
1375105994738,6cyclictest1417271-21munin-plugin-st23:15:000
137510599471,42cyclictest1392072-21grep20:45:260
137510599471,41cyclictest0-21swapper/019:15:170
1375109994637,5cyclictest1413805-21munin-plugin-st22:55:012
1375109994626,10cyclictest0-21swapper/222:55:202
1375107994636,5cyclictest1421441-21grep23:35:311
1375107994632,8cyclictest1420594-21grep23:30:331
137510599462,42cyclictest0-21swapper/000:05:120
137510599461,9cyclictest0-21swapper/000:35:010
137510599461,43cyclictest0-21swapper/023:45:220
1375107994531,8cyclictest1425626-21grep00:00:291
137510599452,4cyclictest1410307-21users22:30:320
137510599452,37cyclictest1382057-21sed19:45:290
1375105994514,4cyclictest1393346-21gpg-connect-age20:55:010
1375105994514,4cyclictest1393346-21gpg-connect-age20:55:010
1375109994434,5cyclictest0-21swapper/221:30:242
137510799442,26cyclictest0-21swapper/122:15:021
1375107994411,27cyclictest231ktimers/100:05:231
1375105994411,30cyclictest1389814-21latency_hist20:35:000
1375109994333,6cyclictest1405918-21grep22:05:332
1375109994331,8cyclictest0-21swapper/219:45:302
1375109994329,8cyclictest0-21swapper/200:15:302
1375107994334,5cyclictest1408523-21grep22:20:311
1375105994334,6cyclictest1380334-21grep19:35:280
1375105994331,8cyclictest1401692-21unixbench_multi21:40:310
1375105994329,11cyclictest1390656-21sendmail20:39:590
137510599431,39cyclictest1404779-21if_eth022:00:210
137510599431,36cyclictest0-21swapper/000:00:010
1375109994223,13cyclictest311ktimers/220:55:122
1375107994233,5cyclictest1422251-21unixbench_multi23:40:301
1375107994226,9cyclictest0-21swapper/119:15:281
137510599422,4cyclictest1380897-21irqstats19:40:240
137510599421,6cyclictest1410795-21irqstats22:35:240
137510599421,5cyclictest1412005-21users22:40:310
1375109994133,5cyclictest14-21rcu_preempt21:55:002
1375109994133,4cyclictest0-21swapper/200:00:172
1375109994131,6cyclictest0-21swapper/219:25:282
1375109994131,5cyclictest0-21swapper/220:40:282
1375107994132,6cyclictest231ktimers/121:55:271
1375107994129,7cyclictest1405126-21grep22:00:281
1375107994128,9cyclictest0-21swapper/119:10:271
1375107994125,8cyclictest0-21swapper/120:35:301
137510799412,32cyclictest1413800-21apt-get22:55:051
1375107994122,10cyclictest0-21swapper/119:55:281
137510799411,33cyclictest1382191-21latency_hist19:50:011
1375105994134,4cyclictest20650irq/252-8000000.ethernet23:00:290
1375105994131,6cyclictest20850irq/208-8000000.ethernet00:20:280
137510599411,4cyclictest1420309-21memory23:30:280
137510599411,4cyclictest1406528-21memory22:10:270
137510599411,35cyclictest0-21swapper/019:25:000
1375109994028,7cyclictest0-21swapper/220:35:302
1375109994027,8cyclictest0-21swapper/222:25:292
1375109994025,11cyclictest311ktimers/219:55:142
137510799408,27cyclictest22-21rcuc/123:55:201
1375107994030,6cyclictest1428124-21grep00:15:301
1375107994027,9cyclictest0-21swapper/121:45:291
1375107994026,9cyclictest0-21swapper/122:30:321
1375107994025,8cyclictest0-21swapper/119:40:291
1375107994023,10cyclictest0-21swapper/120:20:291
1375107994017,3cyclictest2-21kthreadd20:04:221
1375105994030,7cyclictest0-21swapper/022:55:270
137510599401,4cyclictest1421881-21perl23:40:210
137510599401,4cyclictest0-21swapper/020:00:170
137510599401,37cyclictest0-21swapper/023:50:190
137510599401,37cyclictest0-21swapper/023:25:180
137510599401,37cyclictest0-21swapper/022:25:270
137510599401,36cyclictest1418961-21cron23:25:010
137510599401,36cyclictest0-21swapper/021:00:280
137510599401,34cyclictest0-21swapper/000:30:010
137510599401,2cyclictest0-21swapper/000:15:020
137510999393,18cyclictest30-21rcuc/223:05:012
1375109993929,5cyclictest0-21swapper/220:30:272
1375109993928,7cyclictest1418009-21grep23:15:292
1375109993927,8cyclictest0-21swapper/219:35:272
1375107993932,4cyclictest231ktimers/121:00:121
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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