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2026-06-12 - 06:11

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 Jun 12, 2026 00:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2792725997840,7cyclictest14-21rcu_preempt19:50:011
2792724997237,8cyclictest2834715-21/usr/sbin/munin23:15:120
2792724997125,32cyclictest0-21swapper/021:20:010
279272799693,18cyclictest0-21swapper/221:40:132
279272799693,18cyclictest0-21swapper/221:40:132
2792725996913,24cyclictest22-21rcuc/120:45:191
2792724996831,3cyclictest2847720-21df00:30:160
279272499681,64cyclictest0-21swapper/020:30:110
2792727996633,29cyclictest2801315-21grep19:55:282
2792727996633,29cyclictest2801315-21grep19:55:282
2792727996633,28cyclictest2808921-21grep20:40:272
279272799663,15cyclictest0-21swapper/220:10:002
2792727996624,32cyclictest0-21swapper/223:55:282
2792727996624,32cyclictest0-21swapper/223:55:282
2792724996622,40cyclictest2827693-21latency_hist22:35:010
2792724996610,34cyclictest0-21swapper/021:45:020
2792724996610,34cyclictest0-21swapper/021:45:020
2792727996325,29cyclictest0-21swapper/222:25:352
2792724996338,13cyclictest0-21swapper/020:50:120
2792724996320,3cyclictest2820750-21cut21:50:280
2792727996239,19cyclictest2839682-21munin-plugin-st23:45:012
279272799621,55cyclictest1660-21snmpd00:15:252
2792724996233,27cyclictest2843351-21apt00:05:110
2792724996226,7cyclictest2802592-21fschecks_time20:05:200
2792724996223,34cyclictest2804805-21latency_hist20:20:010
2792727996116,35cyclictest0-21swapper/220:55:212
2792724996144,11cyclictest2810892-21apt-get20:55:150
2792724996143,12cyclictest0-21swapper/022:00:120
2792724996132,3cyclictest2841332-21users23:50:290
2792724996124,8cyclictest2816611-21grep21:25:290
2792724996031,4cyclictest2838442-21irqstats23:35:220
2792724996027,4cyclictest2837893-21apt-get23:35:010
2792724996018,39cyclictest2842277-21latency_hist00:00:010
2792724996018,39cyclictest2842277-21latency_hist00:00:010
279272799593,12cyclictest2849110-21head00:35:302
279272799593,11cyclictest2844858-21latency_hist00:15:012
2792727995926,25cyclictest0-21swapper/200:25:272
2792727995916,36cyclictest0-21swapper/220:00:192
2792727995913,6cyclictest2825142-21munin-plugin-st22:19:592
2792724995936,21cyclictest1660-21snmpd22:06:390
2792724995930,3cyclictest2829808-21/usr/sbin/munin22:45:230
2792724995915,38cyclictest0-21swapper/019:30:180
2792727995819,32cyclictest0-21swapper/222:55:302
2792727995816,33cyclictest0-21swapper/200:05:012
2792727995813,37cyclictest0-21swapper/223:00:262
279272799581,10cyclictest2813613-21cut21:10:202
279272499582,24cyclictest0-21swapper/000:30:010
2792724995821,3cyclictest2815523-21meminfo21:20:240
2792724995820,4cyclictest2809281-21diskstats20:45:180
279272799573,12cyclictest2835925-21phc2sys-jitter23:20:262
2792727995730,23cyclictest1283-21cron23:30:012
2792727995718,31cyclictest0-21swapper/222:50:302
2792727995712,34cyclictest0-21swapper/221:15:312
2792724995738,14cyclictest0-21swapper/020:00:140
2792724995729,3cyclictest2794922-21df19:20:150
2792724995728,3cyclictest2833000-21df23:05:160
2792724995713,41cyclictest0-21swapper/019:15:270
2792724995713,41cyclictest0-21swapper/019:15:270
2792724995712,23cyclictest0-21swapper/020:15:020
279272799563,8cyclictest2816657-21grep21:25:302
2792727995626,22cyclictest0-21swapper/222:40:322
2792727995623,25cyclictest2794592-21grep19:15:292
2792727995623,25cyclictest2794592-21grep19:15:292
2792727995619,31cyclictest2823650-21/usr/sbin/munin22:10:262
2792727995619,31cyclictest0-21swapper/220:30:292
2792727995619,28cyclictest0-21swapper/223:10:012
2792724995618,36cyclictest0-21swapper/022:10:170
279272799553,14cyclictest2815806-21head21:20:302
2792727995523,27cyclictest2809798-21grep20:45:282
279272799552,10cyclictest2804695-21tail20:15:302
2792727995516,30cyclictest0-21swapper/223:40:002
2792727995512,35cyclictest0-21swapper/222:50:022
2792724995540,10cyclictest2813590-21diskstats21:10:190
2792724995530,3cyclictest2828171-21meminfo22:35:260
2792724995513,7cyclictest0-21swapper/019:10:090
279272799543,8cyclictest2799624-21grep19:45:282
279272799543,10cyclictest2793419-21grep19:10:282
279272799542,8cyclictest2843947-21grep00:05:302
2792727995422,25cyclictest0-21swapper/223:15:292
2792725995446,5cyclictest2845764-21munin-plugin-st00:20:001
2792724995445,5cyclictest2818388-21munin-plugin-st21:40:000
2792724995441,10cyclictest2836754-21/usr/sbin/munin23:25:250
2792724995440,11cyclictest2806160-21/usr/sbin/munin20:25:240
2792724995423,3cyclictest2831971-21sed23:00:000
2792724995416,36cyclictest2817522-21sshd21:32:230
279272499541,43cyclictest0-21swapper/000:10:100
2792724995413,3cyclictest2830712-21meminfo22:50:250
279272799538,8cyclictest0-21swapper/221:00:282
2792727995329,20cyclictest0-21swapper/223:54:592
279272799532,8cyclictest2806372-21grep20:25:262
2792727995326,20cyclictest0-21swapper/220:35:292
2792727995326,20cyclictest0-21swapper/220:35:292
2792727995312,31cyclictest2810646-21grep20:50:272
2792725995347,4cyclictest231ktimers/119:10:011
2792724995344,5cyclictest2845189-21/usr/sbin/munin00:15:180
2792724995342,8cyclictest2797459-21/usr/sbin/munin19:35:180
2792724995342,7cyclictest2798320-21/usr/sbin/munin19:40:190
2792724995340,10cyclictest2801119-21/usr/sbin/munin19:55:250
2792724995340,10cyclictest2801119-21/usr/sbin/munin19:55:250
2792724995339,9cyclictest2796132-21/usr/sbin/munin19:25:260
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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