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2026-07-02 - 03:08

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #4

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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  Intel
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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, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack5slot4s.osadl.org (updated Thu Jul 02, 2026 00:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
298261624390,3sleep375-21kworker/3:1-events00:10:253
27811802800,2chrt2781178-21sshd20:50:080
2679543996442,19cyclictest1704890-21systemd-journal23:20:000
2679545996257,3cyclictest2686989-21kworker/u8:1+events_unbound20:10:291
2679545996054,4cyclictest2966468-21kworker/u8:2+events_unbound00:15:301
2679545995850,6cyclictest1305440-21kworker/u8:2+flush-8:019:50:271
2679543995638,6cyclictest2780950-21latency_hist20:50:010
2679545995549,4cyclictest2765837-21kworker/u8:0+events_unbound21:20:301
2679543995545,6cyclictest1704890-21systemd-journal00:30:180
2679545995451,2cyclictest1305440-21kworker/u8:2+events_unbound20:50:301
2679545995348,4cyclictest1305440-21kworker/u8:2+events_unbound19:20:271
2679543995342,8cyclictest2720181-21ntpq19:45:230
2679545995145,4cyclictest2868278-21kworker/u8:1+events_unbound23:40:221
2679545995144,5cyclictest2910162-21kworker/u8:3+flush-8:023:35:251
2679545995144,5cyclictest2868278-21kworker/u8:1+flush-8:023:05:321
2679545995044,5cyclictest1305440-21kworker/u8:2+events_unbound20:30:131
2679545995043,5cyclictest1305440-21kworker/u8:2+events_unbound21:00:231
2679545995042,5cyclictest2910162-21kworker/u8:3+flush-8:023:25:251
2679545994944,3cyclictest1305440-21kworker/u8:2+flush-8:019:15:291
2679545994843,4cyclictest2836382-21kworker/u8:0+flush-8:022:55:261
2679545994843,3cyclictest2815709-21kworker/u8:3+flush-8:022:15:261
2679545994841,5cyclictest2765837-21kworker/u8:0+events_unbound21:15:261
2679543994839,7cyclictest2706497-21/usr/sbin/munin19:35:270
2679545994742,3cyclictest2765837-21kworker/u8:0+events_unbound21:40:001
2679545994741,4cyclictest2686989-21kworker/u8:1+events_unbound19:25:251
2679545994739,5cyclictest2815709-21kworker/u8:3+flush-8:022:20:251
2679545994738,7cyclictest2859816-21ntpq22:05:211
2679543994741,4cyclictest2836382-21kworker/u8:0+events_unbound22:25:300
2679543994736,8cyclictest1704890-21systemd-journal20:10:000
2679545994641,3cyclictest2910162-21kworker/u8:3+events_unbound23:45:181
2679545994640,4cyclictest2686989-21kworker/u8:1+flush-8:020:55:291
2679545994639,5cyclictest2686989-21kworker/u8:1+flush-8:019:30:261
2679545994539,4cyclictest2990615-21kworker/u8:3+events_unbound00:30:241
2679545994539,4cyclictest2868278-21kworker/u8:1+events_unbound23:00:251
2679545994539,4cyclictest2868278-21kworker/u8:1+events_unbound23:00:241
2679545994539,4cyclictest2836382-21kworker/u8:0+flush-8:022:10:251
2679545994539,4cyclictest2815709-21kworker/u8:3+flush-8:021:25:231
2679545994534,8cyclictest2889829-21ntpq22:35:241
2679545994532,4cyclictest2836382-21kworker/u8:0+flush-8:022:30:261
2679543994533,10cyclictest1704890-21systemd-journal21:30:010
2679545994439,3cyclictest1305440-21kworker/u8:2+events_unbound20:15:121
2679545994438,4cyclictest2910162-21kworker/u8:3+flush-8:023:30:141
2679545994438,4cyclictest1305440-21kworker/u8:2+events_unbound20:40:261
2679545994339,3cyclictest2974618-21kworker/u8:4+flush-8:000:00:311
2679545994338,4cyclictest2686989-21kworker/u8:1+events_unbound19:35:251
2679545994337,4cyclictest2686989-21kworker/u8:1+flush-8:020:20:241
2679545994337,4cyclictest2686989-21kworker/u8:1+flush-8:020:20:241
2679545994238,3cyclictest2868278-21kworker/u8:1+flush-8:022:40:191
2679545994236,4cyclictest2765837-21kworker/u8:0+flush-8:021:05:241
2679545994236,4cyclictest2765837-21kworker/u8:0+events_unbound20:35:231
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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