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2025-10-29 - 16:54

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 Wed Oct 29, 2025 12:44:18)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
29989423560,2sleep3586-21kworker/3:2+events08:36:353
4277742720,4sleep10-21swapper/110:46:311
5006072630,4chrt500611-21cut11:56:382
5180292580,4chrt0-21swapper/012:16:350
211272995848,7cyclictest223064-21latency_hist07:20:001
211272995848,7cyclictest223064-21latency_hist07:20:001
211269995850,5cyclictest476558-21latency_hist11:35:000
211269995846,9cyclictest512043-21diskstats12:11:300
2436732540,5chrt0-21swapper/107:41:311
211269995447,5cyclictest282-21systemd-journal07:35:010
211272995344,6cyclictest392564-21latency_hist10:10:001
211272995344,6cyclictest392564-21latency_hist10:10:001
211276995131,18cyclictest282-21systemd-journal11:52:492
4501212500,4sleep3586-21kworker/3:2-events11:06:393
211269995044,4cyclictest211419-21kworker/u8:3+flush-8:007:36:330
211276994931,15cyclictest237534-21anacron07:41:432
211272994941,6cyclictest486465-21latency_hist11:45:001
211272994941,6cyclictest486465-21latency_hist11:45:001
211272994938,8cyclictest332156-21ntpq09:06:361
2245582480,6chrt371rcuc/207:21:372
2245582480,6chrt371rcuc/207:21:372
211272994842,4cyclictest382700-21latency_hist10:00:001
211272994736,8cyclictest356906-21ntpq09:31:401
211269994638,6cyclictest471837-21kworker/u8:3+flush-8:012:31:320
211269994637,6cyclictest407377-21latency_hist10:25:010
211269994635,8cyclictest303319-21latency_hist08:40:010
3536522450,4chrt0-21swapper/009:31:330
2577142440,4sleep10-21swapper/107:51:461
211276994436,6cyclictest282-21systemd-journal10:25:002
211272994438,4cyclictest158471-21kworker/u8:0+events_unbound08:10:011
4366262430,5sleep20-21swapper/210:51:452
2770282420,6sleep20-21swapper/208:11:382
211269994231,8cyclictest363007-21cp09:40:020
211269994132,7cyclictest530324-21ntpq12:26:390
211269994131,7cyclictest505739-21ntpq12:01:420
211272994031,6cyclictest282-21systemd-journal07:56:501
211272994029,8cyclictest446911-21latency_hist11:05:011
211276993923,14cyclictest491303-21unixbench_multi11:46:492
211272993935,3cyclictest232470-21kworker/u8:1+flush-8:007:36:441
211272993932,5cyclictest447266-21apt-get11:06:291
211269993931,5cyclictest466660-21latency_hist11:25:010
211269993834,3cyclictest536215-21kworker/u8:2+flush-8:012:36:350
211269993833,4cyclictest446655-21kworker/u8:0+events_unbound11:51:380
211269993832,4cyclictest211419-21kworker/u8:3+events_unbound08:20:010
211269993831,5cyclictest421693-21kworker/u8:3+events_unbound10:45:010
211276993727,7cyclictest282-21systemd-journal09:30:012
211276993620,13cyclictest222165-21grep07:16:402
211276993620,13cyclictest222165-21grep07:16:402
211269993631,4cyclictest158471-21kworker/u8:0+flush-8:007:16:460
211269993631,4cyclictest158471-21kworker/u8:0+flush-8:007:16:460
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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