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2026-03-16 - 08:08

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 Mon Mar 16, 2026 00:44:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
8730623340,3sleep375-21kworker/3:1+events21:31:443
3141721080,3sleep10-21swapper/120:36:441
399242670,1chrt39927-21fschecks_count20:46:362
180812570,3chrt0-21swapper/220:21:452
1412222550,2chrt0-21swapper/222:26:442
4136627995248,3cyclictest154676-21kworker/u8:2+flush-8:022:41:470
4136629995146,3cyclictest4143614-21kworker/u8:0+flush-8:019:20:011
4136627995143,6cyclictest228777-21latency_hist23:55:010
4136629995044,5cyclictest4153316-21kworker/u8:3+events_unbound19:26:451
4136629994842,4cyclictest44248-21kworker/u8:1+flush-8:023:15:001
4136629994841,5cyclictest44248-21kworker/u8:1+events_unbound00:21:471
4136629994841,5cyclictest159436-21latency_hist22:45:011
4136627994741,4cyclictest69431-21kworker/u8:0+flush-8:021:16:500
4136627994641,3cyclictest83815-21kworker/u8:3+flush-8:021:41:530
4136629994536,7cyclictest34704-21/usr/sbin/munin20:41:451
4136627994537,6cyclictest280-21systemd-journal20:20:000
4136633994438,4cyclictest280-21systemd-journal21:26:442
4136629994436,6cyclictest233714-21latency_hist00:00:011
4136627994437,5cyclictest4079075-21kworker/u8:1+events_unbound19:15:020
4136629994335,6cyclictest44248-21kworker/u8:1+flush-8:020:56:501
4136627994338,3cyclictest4188655-21kworker/u8:2+events_unbound21:05:010
4136627994338,3cyclictest19482-21kworker/u8:0+events_unbound20:31:420
4136627994336,5cyclictest98929-21kworker/u8:0+flush-8:022:40:010
4136633994126,13cyclictest65538-21kthreadcore21:11:412
4136629994136,4cyclictest83815-21kworker/u8:3+events_unbound21:51:501
4136629994036,3cyclictest4079075-21kworker/u8:1+flush-8:019:10:001
4136627994030,4cyclictest4079075-21kworker/u8:1+events_unbound19:11:520
4136633993929,8cyclictest280-21systemd-journal23:33:462
4136629993934,4cyclictest98929-21kworker/u8:0+flush-8:022:01:551
4136629993930,3cyclictest4168621-21kworker/u8:2+flush-8:019:41:531
4136627993933,4cyclictest4177724-21kworker/u8:1+flush-8:019:51:500
4136633993830,6cyclictest154236-21gpgv22:40:002
4136633993823,13cyclictest169954-21aten2_r5power_e22:56:362
4136629993834,3cyclictest4143614-21kworker/u8:0+flush-8:020:16:491
4136629993833,4cyclictest4188655-21kworker/u8:2+events_unbound21:11:481
4136627993832,4cyclictest5008-21grep20:11:350
4136629993733,3cyclictest4177724-21kworker/u8:1+flush-8:020:01:511
4136629993730,5cyclictest4079075-21kworker/u8:1+flush-8:019:11:491
4136629993730,5cyclictest219301-21apt-get23:46:331
4136627993731,4cyclictest280-21systemd-journal22:20:010
4136627993731,4cyclictest199162-21kworker/u8:0+flush-8:023:56:520
2541572370,6sleep3451irq_work/300:21:373
1481062370,2sleep2371rcuc/222:31:452
4136633993622,12cyclictest104467-21fschecks_count21:51:382
4136629993632,3cyclictest128987-21kworker/u8:3+events_unbound22:35:011
4136627993632,2cyclictest201rcuc/022:11:530
4136627993630,5cyclictest14070-21kworker/u8:3+flush-8:020:21:540
4136627993629,5cyclictest44248-21kworker/u8:1+flush-8:000:40:010
4136627993626,3cyclictest4143614-21kworker/u8:0+events_unbound19:41:390
413662799360,33cyclictest204124-21munin-run23:30:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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