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2026-05-27 - 20:45

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #7

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.
Unexpectedly long latencies may be caused by SMIs
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 rack7slot7s.osadl.org (updated Wed May 27, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
573329879,8sleep20-21swapper/207:09:042
566428969,9sleep00-21swapper/007:08:100
569228766,6sleep10-21swapper/107:08:311
550128572,9sleep30-21swapper/307:06:043
589399260,26cyclictest0-21swapper/011:18:010
590299250,24cyclictest0-21swapper/309:49:373
590099250,25cyclictest0-21swapper/210:39:322
5896992421,2cyclictest10062-21ntp_states12:10:201
5900992320,2cyclictest994-21users09:10:272
5900992320,2cyclictest31734-21apache_processe11:45:112
5900992320,2cyclictest30614-21ntp_states11:05:182
5900992320,2cyclictest23370-21apache_accesses11:40:102
5900992320,2cyclictest22590-21df_inode11:20:152
5900992320,2cyclictest20933-21apache_volume11:00:112
5900992320,2cyclictest17247-21perl09:40:152
5900992320,2cyclictest16768-21users11:35:262
5900992320,2cyclictest16659-21diskstats11:55:152
5896992320,2cyclictest7494-21irqstats11:30:191
5896992320,2cyclictest30910-21munin-run09:10:001
5896992320,2cyclictest10230-21hddtemp_smartct09:55:171
5893992320,2cyclictest7233-21perl11:30:170
5893992320,2cyclictest20927-21apache_processe11:00:100
5893992320,2cyclictest10961-21diskstats10:15:140
5893992311,6cyclictest8865-21munin-run09:55:000
589399230,20cyclictest0-21swapper/009:49:300
5902992220,1cyclictest7095-21diskstats11:30:163
5902992220,1cyclictest4174-21apache_accesses10:50:103
5902992220,1cyclictest23964-21munin-run12:00:003
5902992219,2cyclictest25238-21ntp_states09:25:213
5900992220,1cyclictest7670-21apache_accesses11:50:112
5900992220,1cyclictest30508-21apache_processe11:25:132
5900992220,1cyclictest14107-21df11:15:142
5900992219,2cyclictest8743-21apache_volume12:10:112
5900992219,2cyclictest537-21snmpd12:03:222
5900992219,2cyclictest4249-21ntp_states10:30:192
5900992219,2cyclictest3741-21munin-run10:50:002
5900992219,2cyclictest28344-21ntp_states10:25:202
5900992219,2cyclictest23908-21apache_processe09:25:132
5896992220,1cyclictest996-21apache_volume09:50:121
5896992220,1cyclictest18678-21apache_processe10:20:121
5896992219,2cyclictest25009-21munin-run12:20:001
5896992219,2cyclictest23947-21users11:20:261
5893992220,1cyclictest27039-21apt-get10:25:130
5893992219,2cyclictest13462-21hddtemp_smartct10:55:170
589399220,5cyclictest0-21swapper/011:44:560
5902992119,1cyclictest6572-21ntp_states11:10:203
5902992119,1cyclictest17674-21apache_accesses10:00:123
5902992118,2cyclictest17080-21apache_processe12:15:103
5902992118,2cyclictest1425-21apache_accesses12:25:113
5902992118,2cyclictest1066-21ntp_states09:30:203
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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