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2025-12-15 - 12:18

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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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 50 highest latencies:
System rack4slot6s.osadl.org (updated Mon Dec 15, 2025 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1365422580,2sleep013653-21cut21:50:360
319121070,3chrt3192-21timerandwakeup23:15:360
3203921000,3sleep032040-21sshd20:55:390
7102987,13sleep0778-21switchtime21:00:340
115052880,4sleep011523-21sed19:35:270
138012834,8sleep013816-21/usr/sbin/munin19:45:010
77622813,5sleep00-21swapper19:20:270
175922800,3sleep017591-21wc22:05:350
50592797,61sleep05100-21memory19:10:250
289692796,61sleep028674-21/usr/sbin/munin22:50:330
389527420,31sleep03900-21ntp_states19:05:300
199632730,3sleep019965-21proc_pri22:15:330
248962700,2sleep024898-21latency_hist20:30:010
225252686,53sleep022526-21ntp_states22:25:310
4795996627,12cyclictest15685-21latency_hist22:00:010
4795996625,16cyclictest21811-21runrttasks22:22:440
4795996324,13cyclictest31750-21ls23:00:350
479599619,18cyclictest1677-21/usr/sbin/munin23:10:330
4795996128,23cyclictest25283-21runrttasks20:30:310
4795996118,13cyclictest288-21snmpd19:17:050
4795996116,14cyclictest26106-21/usr/sbin/munin22:40:280
4795996113,17cyclictest9195-21df_inode23:40:220
57002600,2sleep05702-21awk23:25:320
479599608,14cyclictest6896-21irqstats21:25:270
4795996010,15cyclictest23798-21ntp_states22:30:290
479599599,17cyclictest7827-21/usr/sbin/munin23:35:230
479599599,16cyclictest16046-21ntpq22:00:290
4795995934,15cyclictest15859-21/usr/sbin/munin00:05:280
4795995918,13cyclictest6893-21grep23:30:350
4795995911,22cyclictest11702-21/usr/sbin/munin23:50:390
4795995910,18cyclictest16865-21/usr/sbin/munin00:10:190
479599589,17cyclictest3978-21/usr/sbin/munin23:20:210
479599589,15cyclictest1629-21df21:05:210
479599588,16cyclictest8031-21/usr/sbin/munin21:30:360
479599587,17cyclictest29953-21/usr/sbin/munin22:55:380
4795995835,14cyclictest25004-21/usr/sbin/munin22:35:360
4795995834,15cyclictest21958-21latency_hist00:30:020
4795995834,14cyclictest21353-21/usr/sbin/munin20:15:260
4795995833,16cyclictest4553-21/usr/sbin/munin21:15:340
4795995833,15cyclictest12111-21/usr/sbin/munin21:45:260
4795995832,16cyclictest23354-21/usr/sbin/munin00:35:200
479599578,17cyclictest22434-21/usr/sbin/munin20:20:310
479599578,16cyclictest3057-21memory21:10:270
479599578,15cyclictest22075-21egrep00:30:190
479599577,15cyclictest8999-21/usr/sbin/munin19:25:260
4795995731,16cyclictest9921-21/usr/sbin/munin21:35:430
4795995711,16cyclictest13040-21df_inode23:55:210
4795995710,15cyclictest19464-21/usr/sbin/munin00:20:350
479599569,17cyclictest10151-21/usr/sbin/munin19:30:230
479599569,16cyclictest13929-21seq19:45:080
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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