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2026-08-14 - 06:40

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, 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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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.

Total number of samples: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack4slot6s.osadl.org (updated Fri Aug 14, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1118921540,2sleep011191-21timerandwakeup00:10:270
874821490,3sleep08747-21wc21:55:280
1634421270,3chrt16345-21switchtime00:30:280
30469991198,97cyclictest2136-21awk21:30:260
2025721190,3chrt20254-21ls20:35:190
30469991188,13cyclictest7074-21ntp_states23:55:220
304699911810,17cyclictest3467-21memory19:30:170
304699911810,16cyclictest21774-21users22:45:300
304699911810,15cyclictest30524-21ntp_states23:20:220
2644321180,5chrt26444-21cat23:05:140
30469991179,12cyclictest13608-21memory22:15:180
3178321160,4chrt31779-21ntpq23:25:190
30469991168,17cyclictest22645-21/usr/sbin/munin22:50:170
304699911611,17cyclictest28878-21grep23:15:020
304699911610,16cyclictest30634-21df_inode19:10:130
30469991159,16cyclictest16306-21ntp_states22:25:220
30469991159,13cyclictest12281-21pluginstate00:15:260
30469991158,16cyclictest770-21df_inode19:20:130
30469991158,15cyclictest18956-21memory20:30:180
30469991149,15cyclictest5689-21memory23:50:170
30469991149,15cyclictest506-21cat23:30:180
30469991148,15cyclictest11959-21chrt22:09:370
30469991148,14cyclictest3182-21cat19:30:020
30469991148,14cyclictest1918-21ntp_states23:35:210
30469991148,14cyclictest12323-21/usr/sbin/munin22:10:170
30469991147,16cyclictest4156-21sed23:45:010
30469991139,15cyclictest17779-21ntpq20:25:210
30469991138,15cyclictest4406-21memory23:45:180
30469991138,14cyclictest18874-21ntp_states22:35:220
30469991138,13cyclictest14881-21open_inodes00:25:260
30469991137,13cyclictest21655-21ntp_states20:40:210
30469991136,16cyclictest17264-21irqstats00:35:170
304699911332,71cyclictest29169-21/usr/sbin/munin21:10:140
30469991129,13cyclictest23517-21seq20:47:420
30469991128,15cyclictest16391-21memory20:20:180
30469991128,15cyclictest14945-21df_inode20:15:130
30469991127,13cyclictest67602sleep019:42:490
304699911227,71cyclictest24031-21/usr/sbin/munin20:50:140
30469991119,13cyclictest25347-21ntp_states23:00:220
30469991118,18cyclictest13741-21/usr/sbin/munin20:10:160
30469991118,14cyclictest30984-21users21:15:290
30469991118,14cyclictest276-21runrttasks21:40:010
30469991118,14cyclictest10619-21ls00:10:020
30469991118,12cyclictest31996-21ntp_states21:20:220
30469991117,15cyclictest15942-21cut22:25:010
30469991117,13cyclictest5328-21chrt21:43:060
30469991117,13cyclictest25290-21/usr/sbin/munin20:55:140
30469991116,15cyclictest10661-21chrt22:04:300
304699911110,14cyclictest13662-21/usr/sbin/munin00:20:250
30469991109,14cyclictest748-21ls21:25:210
30469991109,11cyclictest7152-21/usr/sbin/munin19:45:140
30469991108,15cyclictest5737-21systemctl19:40:010
30469991108,14cyclictest9413-21seq19:53:330
30469991108,14cyclictest27729-21latency_hist21:05:010
30469991108,13cyclictest9321-21latency_hist00:05:010
30469991108,13cyclictest20978-21sshd22:44:250
30469991107,15cyclictest11177-21irqstats20:00:170
30469991107,13cyclictest31912-21df19:15:130
30469991107,13cyclictest276-21runrttasks20:05:250
30469991106,14cyclictest9800-21forks19:55:130
30469991098,15cyclictest6976-21/usr/sbin/munin21:50:180
30469991098,15cyclictest17362-21sh22:30:120
30469991097,16cyclictest27954-21irqstats21:05:180
30469991097,12cyclictest5744-21df21:45:130
304699910916,9cyclictest24610-21chrt22:57:370
304699910915,14cyclictest28914-21/usr/sbin/munin23:15:150
30469991047,14cyclictest30483-21latency_hist19:10:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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