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2026-09-22 - 14:55

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #6

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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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
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackeslot6s.osadl.org (updated Tue Sep 22, 2026 00:44:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
47871699812,34cyclictest513208-21/usr/sbin/munin22:30:231
47871699812,34cyclictest513208-21/usr/sbin/munin22:30:221
47871899668,21cyclictest0-21swapper/219:15:012
478718996611,15cyclictest30-21rcuc/219:50:172
478718996611,15cyclictest30-21rcuc/219:50:172
478713996134,24cyclictest521629-21sendmail23:20:000
478718995622,9cyclictest30-21rcuc/222:30:022
478718995622,9cyclictest30-21rcuc/222:30:022
47871899558,22cyclictest32-21ksoftirqd/222:15:002
478718995545,5cyclictest493411-21munin-plugin-st20:35:012
478713995448,4cyclictest131ktimers/019:20:190
478718995234,11cyclictest502648-21grep21:25:272
478718995234,11cyclictest502648-21grep21:25:272
478716995242,5cyclictest481507-21munin-plugin-st19:25:001
478713995244,5cyclictest507856-21sendmail21:59:590
478713995218,24cyclictest527911-21/usr/sbin/munin23:55:190
47871899514,26cyclictest32-21ksoftirqd/219:35:012
478718995129,19cyclictest528769-21/usr/sbin/munin00:00:202
47871399518,5cyclictest0-21swapper/020:05:010
478718995043,5cyclictest0-21swapper/200:15:022
478718995025,13cyclictest32-21ksoftirqd/223:10:182
47871899501,11cyclictest0-21swapper/221:25:002
478718994936,5cyclictest0-21swapper/222:25:002
47871699493,37cyclictest517851-21tail22:55:261
47871699493,37cyclictest517851-21tail22:55:261
478718994833,10cyclictest0-21swapper/223:55:012
478716994839,4cyclictest487405-21grep19:55:271
478716994812,29cyclictest502641-21unixbench_singl21:25:281
478716994812,29cyclictest502641-21unixbench_singl21:25:281
47871399480,44cyclictest508805-21latency_hist22:05:000
478718994734,7cyclictest518992-21grep23:00:272
478718994729,12cyclictest0-21swapper/223:30:212
478718994729,12cyclictest0-21swapper/223:30:202
478718994710,14cyclictest32-21ksoftirqd/222:25:012
478718994635,7cyclictest531076-21grep00:10:302
478718994632,8cyclictest535368-21grep00:35:292
478718994535,6cyclictest525082-21sh23:39:592
478718994534,8cyclictest0-21swapper/219:25:002
478718994533,8cyclictest528555-21sendmail00:00:002
478716994537,5cyclictest0-21swapper/123:54:591
478716994532,8cyclictest0-21swapper/100:20:301
478713994539,3cyclictest0-21swapper/021:15:260
478713994536,4cyclictest20850irq/208-8000000.ethernet23:10:190
478713994533,9cyclictest0-21swapper/022:55:010
478713994531,9cyclictest0-21swapper/023:20:260
478713994523,16cyclictest0-21swapper/020:20:280
47871399451,3cyclictest0-21swapper/022:30:290
47871399451,3cyclictest0-21swapper/022:30:280
47871399451,37cyclictest0-21swapper/000:20:020
478718994435,6cyclictest507008-21munin-plugin-st21:55:002
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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