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2026-06-20 - 01:46

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 Fri Jun 19, 2026 12:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
347635521040,3chrt451irq_work/309:50:403
334034221020,3chrt75-21kworker/3:1-events07:35:313
3311399997463,8cyclictest3416666-21ntpq08:50:330
3311402997157,9cyclictest1704890-21systemd-journal12:20:391
3311399997057,11cyclictest3272026-21kworker/u8:3+flush-8:008:00:370
3311402996448,13cyclictest3417854-21/usr/sbin/munin08:55:331
3311399996451,10cyclictest3491064-21ntpq10:05:350
3311402996251,9cyclictest3322201-21ntpq07:15:391
3311402996251,8cyclictest3505947-21ntpq10:20:361
3311402996247,10cyclictest1704890-21systemd-journal08:45:301
3311406996155,4cyclictest3375051-21kworker/u8:3+flush-8:008:55:372
3311399996152,6cyclictest3338408-21kworker/u8:0+flush-8:007:35:270
3311399996150,8cyclictest3625266-21ntpq12:20:360
3311402995949,8cyclictest1704890-21systemd-journal12:00:011
3311399995949,8cyclictest3332323-21ntpq07:25:360
3311399995949,7cyclictest3462090-21apt-get09:40:000
3311399995847,8cyclictest1704890-21systemd-journal09:25:300
3311399995844,5cyclictest3282938-21kworker/u8:2+flush-8:007:20:370
3311399995751,5cyclictest3419838-21kworker/u8:1+events_unbound09:40:380
3311399995746,8cyclictest3580830-21ntpq11:35:350
3311406995651,3cyclictest3282938-21kworker/u8:2+flush-8:007:45:412
3311402995648,5cyclictest3590622-21ntpq11:45:321
3311402995647,6cyclictest3605468-21ntpq12:00:351
3311402995642,11cyclictest3571720-21/usr/sbin/munin11:30:331
3311402995633,12cyclictest3387049-21ntpq08:20:331
3311399995652,2cyclictest3282938-21kworker/u8:2+flush-8:008:35:450
3311406995449,4cyclictest3367338-21kworker/u8:1+flush-8:008:05:342
3311406995448,4cyclictest3545841-21kworker/u8:1+events_unbound11:05:382
3311399995448,4cyclictest3282938-21kworker/u8:2+flush-8:007:40:320
3311399995444,7cyclictest1704890-21systemd-journal08:30:010
3311399995443,9cyclictest3500980-21ntpq10:15:350
3311399995443,7cyclictest3282938-21kworker/u8:2+flush-8:008:10:360
3311402995342,9cyclictest3555683-21ntpq11:10:331
3311399995347,4cyclictest3556840-21kworker/u8:0+events_unbound11:40:410
3311399995347,4cyclictest3556840-21kworker/u8:0+events_unbound11:40:410
3311399995345,5cyclictest3375051-21kworker/u8:3+events_unbound09:30:400
3311406995243,7cyclictest3541749-21awk11:00:002
3311399995241,8cyclictest3481141-21ntpq09:55:350
3311406995146,4cyclictest3375051-21kworker/u8:3+flush-8:008:50:402
3311406995145,4cyclictest3476782-21kworker/u8:0+flush-8:010:50:402
3311402995141,7cyclictest3640310-21ntpq12:35:331
3311406995045,3cyclictest3493894-21kworker/u8:3+flush-8:010:10:362
3311406995045,3cyclictest3419838-21kworker/u8:1+flush-8:009:50:412
3311406995042,6cyclictest3561664-21cat11:20:012
3311399995044,4cyclictest3282938-21kworker/u8:2+flush-8:009:20:300
3311399995043,5cyclictest3296187-21kworker/u8:0+flush-8:007:10:400
3311399995042,6cyclictest3325750-21kworker/u8:1+flush-8:007:30:330
3311399995039,9cyclictest3615462-21ntpq12:10:400
3311406994944,3cyclictest3563517-21kworker/u8:3+flush-8:011:25:262
3311406994844,3cyclictest3606612-21kworker/u8:1+flush-8:012:35:372
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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