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2026-04-21 - 20:46

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack4slot1s.osadl.org (updated Tue Apr 21, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1259821430,5sleep112601-21unixbench-2d10:52:271
1259821430,5sleep112601-21unixbench-2d10:52:271
2509021030,3sleep30-21swapper/308:32:283
2509021030,3sleep30-21swapper/308:32:283
93592940,3chrt0-21swapper/107:52:181
93592940,3chrt0-21swapper/107:52:181
172322920,3sleep10-21swapper/108:12:241
172322920,3sleep10-21swapper/108:12:241
226542710,3sleep022648-21gzip08:27:220
226542710,3sleep022648-21gzip08:27:220
161332660,2sleep016138-21tail09:37:170
161332660,2sleep016138-21tail09:37:170
161332660,2sleep016138-21tail09:37:170
251922630,3chrt0-21swapper/211:27:222
251922630,3chrt0-21swapper/211:27:222
131922610,3sleep00-21swapper/010:57:090
131922610,3sleep00-21swapper/010:57:090
103592550,3chrt0-21swapper/010:47:240
103592550,3chrt0-21swapper/010:47:240
277022530,3chrt0-21swapper/208:42:162
277022530,3chrt0-21swapper/208:42:162
277022530,3chrt0-21swapper/208:42:162
325732510,2sleep20-21swapper/210:22:132
325732510,2sleep20-21swapper/210:22:132
275292490,3sleep20-21swapper/210:07:182
275292490,3sleep20-21swapper/210:07:182
226432450,1sleep00-21swapper/011:22:130
226432450,1sleep00-21swapper/011:22:130
143392440,4sleep20-21swapper/209:32:182
143392440,4sleep20-21swapper/209:32:182
103122440,3sleep20-21swapper/209:22:162
103122440,3sleep20-21swapper/209:22:162
26573994233,7cyclictest29919-21latency_hist11:42:031
26573994233,7cyclictest29919-21latency_hist11:42:031
26567994035,4cyclictest8069-21cut10:42:180
26567994035,4cyclictest8069-21cut10:42:180
299322380,2sleep130041-21/usr/sbin/munin08:47:181
299322380,2sleep130041-21/usr/sbin/munin08:47:181
91832370,3sleep20-21swapper/209:17:252
91832370,3sleep20-21swapper/209:17:252
326122360,3sleep30-21swapper/310:22:143
26573993627,7cyclictest6204-21latency_hist09:12:031
26573993627,7cyclictest6204-21latency_hist09:12:031
26567993630,5cyclictest6111-21fschecks_time10:37:190
26567993630,5cyclictest6111-21fschecks_time10:37:190
26567993630,5cyclictest6111-21fschecks_time10:37:190
208772360,2sleep121005-21fschecks_time11:17:171
208772360,2sleep121005-21fschecks_time11:17:171
208772360,2sleep121005-21fschecks_time11:17:171
145522360,3sleep20-21swapper/208:07:142
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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