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2026-04-17 - 01:44

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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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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 50 highest latencies:
System rackeslot4s.osadl.org (updated Thu Apr 16, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2341620995550,4cyclictest2309430-21kworker/u8:0+flush-259:007:35:263
2341620995249,2cyclictest2527886-21kworker/u8:4+flush-259:010:50:163
2341612995247,4cyclictest2632316-21kworker/u8:0+flush-259:012:15:251
2341620995148,2cyclictest2596160-21kworker/u8:1+events_unbound11:45:233
2341620994642,3cyclictest2527886-21kworker/u8:4+flush-259:010:45:163
2341620994642,3cyclictest2434877-21kworker/u8:2+events_unbound08:40:143
2341620994441,2cyclictest2372918-21kworker/u8:3+events_unbound09:25:223
2341615994441,2cyclictest2326297-21kworker/u8:1+flush-259:007:20:202
2341620994340,2cyclictest2632316-21kworker/u8:0+events_unbound11:50:223
2341620994340,2cyclictest2419076-21kworker/u8:1+flush-259:010:25:213
2341612994337,4cyclictest2341802-21/usr/sbin/munin07:10:131
2341620994238,3cyclictest2434877-21kworker/u8:2+flush-259:009:00:113
2341615994238,3cyclictest2491375-21kworker/u8:2+events_unbound09:50:142
2341620994138,2cyclictest2527886-21kworker/u8:4+events_unbound11:40:233
2341620994138,2cyclictest2434877-21kworker/u8:2+flush-259:008:45:153
2341620994138,2cyclictest2434877-21kworker/u8:2+events_unbound08:55:193
2341615994034,4cyclictest252-21systemd-journal11:55:222
2341612994035,4cyclictest252-21systemd-journal08:59:541
2341612994033,5cyclictest252-21systemd-journal10:55:171
2341620993936,2cyclictest2564163-21kworker/u8:3+events_unbound12:00:183
2341620993935,2cyclictest2564163-21kworker/u8:3+events_unbound11:10:173
2341615993936,2cyclictest2527886-21kworker/u8:4+flush-259:011:35:162
2341615993935,3cyclictest2632316-21kworker/u8:0+flush-259:012:20:252
2341615993935,3cyclictest2507273-21kworker/u8:3+flush-259:010:10:212
2341620993834,3cyclictest2309430-21kworker/u8:0+events_unbound08:15:003
2341620993834,2cyclictest2424413-21kworker/u8:0+flush-259:008:35:223
2341615993835,2cyclictest2326297-21kworker/u8:1+flush-259:007:45:162
2341615993835,2cyclictest2326297-21kworker/u8:1+flush-259:007:45:152
2341612993834,3cyclictest2419076-21kworker/u8:1+flush-259:008:40:241
2341620993734,2cyclictest2527886-21kworker/u8:4+flush-259:011:15:263
2341620993734,2cyclictest2326297-21kworker/u8:1+events_unbound07:20:153
2341620993733,3cyclictest2657595-21kworker/u8:2+events_unbound12:25:223
2341615993731,4cyclictest252-21systemd-journal11:50:002
2341612993731,4cyclictest2595447-21apt-get11:15:111
2341620993633,2cyclictest2434877-21kworker/u8:2+flush-259:009:10:233
2341620993633,2cyclictest2372918-21kworker/u8:3+flush-259:008:15:243
2341620993633,2cyclictest2309430-21kworker/u8:0+flush-259:008:20:213
2341620993632,3cyclictest2372918-21kworker/u8:3+flush-259:008:25:153
2341615993632,3cyclictest2596160-21kworker/u8:1+flush-259:011:16:222
2341615993632,3cyclictest2434877-21kworker/u8:2+flush-259:008:50:222
2341615993632,2cyclictest2564163-21kworker/u8:3+flush-259:010:55:272
2341620993532,2cyclictest2491375-21kworker/u8:2+events_unbound09:35:143
2341620993532,2cyclictest2372918-21kworker/u8:3+events_unbound09:16:223
2341620993531,3cyclictest2372918-21kworker/u8:3+events_unbound08:00:193
2341615993532,2cyclictest2372918-21kworker/u8:3+flush-259:008:00:232
2341615993531,3cyclictest2522764-21kworker/u8:0+flush-259:010:05:192
2341615993531,3cyclictest2419076-21kworker/u8:1+flush-259:008:25:202
2341615993531,3cyclictest2326297-21kworker/u8:1+flush-259:007:25:202
2341612993528,5cyclictest2383193-21latency_hist07:50:011
2341612993528,5cyclictest2383193-21latency_hist07:50:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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