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2026-06-27 - 20:19

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 Sat Jun 27, 2026 12:44:19)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
303832980,2chrt0-21swapper/208:08:282
303832980,2chrt0-21swapper/208:08:282
214102700,2sleep10-21swapper/110:38:261
214102700,2sleep10-21swapper/110:38:261
242942620,1sleep124297-21ntp_kernel_pll_07:53:231
92562550,3chrt0-21swapper/211:33:222
92562550,3chrt0-21swapper/211:33:222
92562550,3chrt0-21swapper/211:33:222
279452450,2sleep30-21swapper/309:28:293
279452450,2sleep30-21swapper/309:28:293
8568994135,4cyclictest545-21in:imuxsock10:02:351
8568994135,4cyclictest545-21in:imuxsock10:02:351
8568994135,4cyclictest545-21in:imuxsock10:02:351
321172400,3sleep20-21swapper/212:33:282
321172400,3sleep20-21swapper/212:33:282
321172400,3sleep20-21swapper/212:33:282
199772400,6sleep1281ktimers/109:08:251
199772400,6sleep1281ktimers/109:08:251
137812400,3sleep30-21swapper/308:53:193
137812400,3sleep30-21swapper/308:53:193
8568993929,7cyclictest9828-21threads11:33:291
8568993929,7cyclictest9828-21threads11:33:291
8568993929,7cyclictest9828-21threads11:33:291
8568993830,6cyclictest5152-21forks11:23:191
197722380,3sleep30-21swapper/307:43:163
197722380,3sleep30-21swapper/307:43:163
197722380,3sleep30-21swapper/307:43:163
168512380,2sleep016946-21/usr/sbin/munin07:33:250
168512380,2sleep016946-21/usr/sbin/munin07:33:250
168512380,2sleep016946-21/usr/sbin/munin07:33:250
284772370,2sleep128478-21/usr/sbin/munin12:23:261
284772370,2sleep128478-21/usr/sbin/munin12:23:261
8567993628,6cyclictest32671-21cron08:18:070
8567993628,6cyclictest32671-21cron08:18:070
8567993627,7cyclictest20735-21cut10:38:180
8567993627,7cyclictest20735-21cut10:38:180
8568993528,4cyclictest0-21swapper/110:23:051
8568993528,4cyclictest0-21swapper/110:23:051
8568993528,4cyclictest0-21swapper/110:23:051
8568993526,7cyclictest9032-21threads08:38:291
8568993526,7cyclictest9032-21threads08:38:291
8567993529,5cyclictest31200-21unixbench_singl11:03:290
8567993529,5cyclictest31200-21unixbench_singl11:03:290
225672350,2sleep122580-21gzip12:08:241
225672350,2sleep122580-21gzip12:08:241
8568993328,3cyclictest24442-21needreboot12:13:221
8568993328,3cyclictest24442-21needreboot12:13:221
8568993328,3cyclictest24442-21needreboot12:13:221
8568993327,4cyclictest24625-21fschecks_time10:48:181
8568993327,4cyclictest24625-21fschecks_time10:48:181
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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