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2026-04-06 - 21:21

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 Mon Apr 06, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1575090996947,19cyclictest1715927-21cp09:30:012
16452342630,5sleep375-21kworker/3:1+mm_percpu_wq08:16:303
19006872620,4chrt0-21swapper/012:36:230
1575088996055,3cyclictest1601902-21kworker/u8:0+events_unbound08:56:361
1575088995650,4cyclictest1880415-21kworker/u8:0+flush-8:012:16:391
1575085995650,4cyclictest1766348-21apt-get10:20:370
1575088995547,6cyclictest1601902-21kworker/u8:0+flush-8:008:01:321
1575088995447,5cyclictest738143-21kworker/u8:4+flush-8:008:06:331
1575088995245,5cyclictest1800977-21kworker/u8:1+flush-8:011:21:371
1575088995245,5cyclictest1766079-21kworker/u8:0+events_unbound11:56:341
1575088995245,5cyclictest1601902-21kworker/u8:0+flush-8:009:26:371
1575088995144,5cyclictest1850246-21kworker/u8:1+events_unbound11:51:351
1575088995043,5cyclictest1755896-21kworker/u8:2+flush-8:010:11:371
1575085995031,17cyclictest1575310-21/usr/sbin/munin07:11:320
1575088994840,6cyclictest1522702-21kworker/u8:0+flush-8:007:16:331
157508599481,33cyclictest589-21runrttasks08:26:330
1575088994742,4cyclictest1850246-21kworker/u8:1+flush-8:012:01:351
1575088994742,4cyclictest1755896-21kworker/u8:2+events_unbound10:26:351
1575088994742,4cyclictest1601902-21kworker/u8:0+events_unbound07:41:331
1575085994727,17cyclictest1805751-21systemd-run11:00:010
1575088994641,4cyclictest1815837-21kworker/u8:3+events_unbound11:16:361
1575085994637,6cyclictest1790849-21latency_hist10:45:010
1575085994636,8cyclictest1829578-21ntpq11:21:310
1575088994540,4cyclictest738143-21kworker/u8:4+flush-8:007:11:371
1575088994540,4cyclictest1815837-21kworker/u8:3+flush-8:011:11:321
1575088994538,5cyclictest738143-21kworker/u8:4+flush-8:007:21:341
1575088994529,4cyclictest1800977-21kworker/u8:1+flush-8:011:31:291
1575088994439,3cyclictest1796006-21kworker/u8:2+events_unbound11:30:011
1575088994438,5cyclictest1800977-21kworker/u8:1+events_unbound10:56:381
1575088994438,4cyclictest738143-21kworker/u8:4+flush-8:008:31:381
1575088994438,4cyclictest1796006-21kworker/u8:2+events_unbound11:01:361
1575090994328,12cyclictest1653619-21kthreadcore08:26:282
1575088994339,3cyclictest1601902-21kworker/u8:0+flush-8:009:06:361
1575088994338,4cyclictest738143-21kworker/u8:4+events_unbound08:41:331
1575088994338,4cyclictest738143-21kworker/u8:4+events_unbound08:41:331
1575088994337,4cyclictest1691104-21kworker/u8:1+flush-8:010:46:321
1575088994337,4cyclictest1691104-21kworker/u8:1+flush-8:010:46:321
1575088994333,7cyclictest1691104-21kworker/u8:1+flush-8:009:11:331
1575085994335,5cyclictest1785896-21latency_hist10:40:000
1575085994327,14cyclictest1869936-21unixbench_multi12:01:400
1575085994324,17cyclictest1762192-21irqrtprio10:16:260
157508599431,32cyclictest1660344-21ntpq08:31:320
1575088994237,4cyclictest1574942-21kworker/u8:2+events_unbound07:46:341
1575088994236,5cyclictest1741552-21kworker/u8:3+flush-8:010:16:271
1575088994236,4cyclictest1865567-21kworker/u8:4+events_unbound12:06:311
1575088994236,4cyclictest1705739-21latency_hist09:20:011
1575088994235,5cyclictest1596925-21kworker/u8:1+flush-8:007:31:381
1575085994215,23cyclictest1884510-21python312:16:380
1575085994212,22cyclictest1855902-21idleruntime11:51:240
1575090994123,15cyclictest1626440-21awk08:00:002
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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