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2026-03-25 - 19:55

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 Wed Mar 25, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
981222370,3sleep09813-21readlink10:25:270
182922150,3sleep01826-21ps12:00:240
3028121270,3chrt30201-21/usr/sbin/munin09:40:130
136021260,3chrt1363-21sendmail12:00:010
487421230,4chrt4873-21/usr/sbin/munin08:00:270
2269421190,3sleep022695-21mailstats11:15:260
2688421170,3chrt26887-21wc09:25:270
2219621120,4chrt22193-21cat11:15:020
952821090,3chrt9529-21awk12:30:230
689521080,4chrt6894-21wc08:10:020
237989910374,17cyclictest3187-21ntp_states10:00:220
237989910274,17cyclictest367-21df_inode09:50:140
237989910270,18cyclictest19688-21/usr/sbin/munin11:05:140
237989910174,14cyclictest7256-21chrt12:20:290
2396021000,4sleep023982-21sort07:10:140
23798999977,14cyclictest28878-21runrttasks07:29:340
23798999974,14cyclictest5926-21systemctl10:10:260
23798999974,14cyclictest24011-21ntp_states09:15:220
23798999973,15cyclictest22626-21memory09:10:170
23798999972,16cyclictest2472-21chrt09:57:450
23798999873,16cyclictest17017-21grep10:55:010
23798999873,13cyclictest307-21munin-node11:40:100
23798999870,17cyclictest17261-21/usr/sbin/munin08:50:170
23798999773,14cyclictest23572-21/usr/sbin/munin11:20:260
23798999770,15cyclictest16573-21vmstat08:45:300
23798999770,14cyclictest4242-21/usr/sbin/munin12:10:170
23798999767,17cyclictest12385-21ntp_states08:30:210
23798999755,15cyclictest18164-21sshd10:59:240
23798999670,14cyclictest15000-21/usr/sbin/munin10:45:260
23798999669,14cyclictest5417-21/usr/sbin/munin12:15:140
23798999668,18cyclictest13238-21/usr/sbin/munin10:40:130
23798999665,18cyclictest20140-21ntp_states09:00:210
23798999572,14cyclictest14388-21chrt08:38:500
23798999571,13cyclictest10601-21/usr/sbin/munin12:35:140
23798999570,14cyclictest288-21snmpd07:15:260
23798999568,16cyclictest12071-21chrt10:35:160
23798999568,14cyclictest2773-21/usr/sbin/munin12:05:140
23798999561,21cyclictest3329-21ntp_states07:55:210
23798999469,15cyclictest9817-21ntpq08:20:220
23798999469,15cyclictest6762-21/usr/sbin/munin10:15:180
23798999465,17cyclictest9311-21latency_hist10:25:010
23798999459,21cyclictest1765-21/usr/sbin/munin07:50:160
23798999458,17cyclictest30277-21ntpq11:45:190
23798999453,27cyclictest4193-21/usr/sbin/munin10:05:190
23798999453,26cyclictest30347-21/usr/sbin/munin07:35:250
23798999452,15cyclictest25047-21chrt09:20:110
23798999370,13cyclictest27871-21ntp_kernel_pll_09:30:220
23798999366,16cyclictest10784-21runrttasks10:30:130
23798999364,16cyclictest288-21snmpd09:06:020
23798999359,19cyclictest31656-21wc09:45:160
23798999267,15cyclictest32026-21runrttasks11:51:260
23798999266,14cyclictest14981-21ntpq08:40:210
23798999260,18cyclictest29339-21ntpq07:30:190
23798999257,21cyclictest28893-21/usr/sbin/munin09:35:170
23798999256,21cyclictest27428-21/usr/sbin/munin11:35:100
23798999168,14cyclictest7117-21memory08:10:180
23798999166,16cyclictest19773-21sed09:00:020
23798999166,14cyclictest8228-21ntp_states12:25:220
23798999166,14cyclictest760-21ntp_states07:45:210
23798999166,13cyclictest8401-21memory08:15:170
23798999160,19cyclictest11083-21ntpq08:25:210
23798999061,16cyclictest26689-21memory07:20:180
23798999057,20cyclictest26026-21awk11:29:590
23798998968,12cyclictest18861-21cut11:00:260
23798998966,13cyclictest31738-21awk07:40:130
23798998965,13cyclictest26435-21ntp_states11:30:220
23798998253,17cyclictest23828-21grep07:10:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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