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2025-11-10 - 08:23

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #f, slot #4

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: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 792 highest latencies:
System rackfslot4s.osadl.org (updated Mon Nov 10, 2025 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1780421200,3chrt17803-21sleep00:11:190
2467021190,3chrt24671-21timerwakeupswit20:26:290
2322121110,3chrt23222-21sleep00:21:380
504221100,2chrt5043-21modprobe21:51:300
2989021050,2sleep029891-21stty23:35:330
327632950,2sleep032766-21cut22:41:480
5592870,2sleep0560-21ssh21:44:270
292452830,2sleep029246-21cat19:32:200
287452790,2chrt28725-21ntpq21:36:170
79982780,2sleep07996-21entropy22:55:470
114322770,2sleep011435-21tail00:00:410
117012600,2sleep011745-21timerandwakeup20:01:280
295592590,2sleep029665-21cut22:36:070
6162584,9sleep0642-21perl23:40:550
175682552,7sleep017574-21ld21:16:370
218172513,9sleep021815-21ntp_states20:21:110
81042500,3sleep08101-21ssh23:54:410
288222503,7sleep028825-21ssh00:31:390
178842503,8sleep0886-21sh19:10:490
155872500,1sleep015585-21python300:07:220
110082503,6sleep010990-21apt-get21:05:180
80822490,2chrt8080-21/usr/sbin/munin21:57:080
272112493,38sleep027214-21ssh00:28:070
52602480,3chrt5258-21/usr/sbin/munin22:50:500
16898904816,24cyclictest0-21swapper22:20:070
327382473,37sleep032743-21sleep20:43:200
277872473,35sleep027784-21users22:32:200
16898904718,22cyclictest0-21swapper21:28:570
16898904717,22cyclictest0-21swapper00:15:060
1537724711,21sleep015386-21ntpq19:05:400
16898904620,18cyclictest3218-21ssh23:45:390
96872453,34sleep09690-21sleep19:58:120
1689890457,10cyclictest8937-21hddtemp_smartct21:00:390
1689890457,10cyclictest1782-21ssh21:46:280
1689890456,20cyclictest8748-21ssh23:55:420
16898904515,22cyclictest0-21swapper22:08:470
16898904515,22cyclictest0-21swapper21:23:100
281132440,2sleep028176-21wc20:35:030
1689890447,29cyclictest25576-21ssh23:26:510
16898904418,19cyclictest0-21swapper23:23:180
16898904416,21cyclictest0-21swapper22:13:300
16898904416,21cyclictest0-21swapper21:32:410
16898904415,22cyclictest0-21swapper00:36:550
16898904415,21cyclictest0-21swapper22:45:090
16898904414,23cyclictest0-21swapper21:13:060
130512440,3chrt13052-21latency_hist23:05:040
281972432,6sleep028201-21ssh23:31:330
1689890436,10cyclictest28572-21df_inode20:35:310
1689890435,10cyclictest18935-21irqstats20:15:440
16898904314,22cyclictest0-21swapper23:17:510
16898904220,15cyclictest0-21swapper23:08:020
16898904218,17cyclictest0-21swapper23:14:160
16898904213,22cyclictest0-21swapper22:02:550
16898904212,21cyclictest0-21swapper22:28:170
1689890415,28cyclictest17699-21/usr/sbin/munin22:17:150
1689890415,16cyclictest19387-21apt-get19:15:140
1689890405,9cyclictest673-21hddtemp_smartct19:40:380
1689890405,27cyclictest1846-21ntpq20:45:550
16898904016,14cyclictest0-21swapper19:20:310
16898904015,19cyclictest6377-21perl20:55:370
16898904014,11cyclictest6948-21sleep19:52:180
16898904012,9cyclictest31295-21ntp_states19:36:180
1689890396,8cyclictest3697-21ntpq19:45:530
1689890395,15cyclictest4872-21users20:51:290
1689890384,17cyclictest25861-21ntpq19:25:580
16898903814,17cyclictest12696-21apt-get20:05:280
16898903813,19cyclictest15769-21sshd20:10:270
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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