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2025-09-18 - 03:29

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 Thu Sep 18, 2025 00:44:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
878522350,3sleep08787-21grep21:25:200
1688721240,2sleep016889-21modprobe22:00:010
65259912130,66cyclictest1320-21latency_hist23:05:020
65259912031,79cyclictest17303-21/usr/sbin/munin22:00:240
65259911834,72cyclictest7848-21/usr/sbin/munin21:20:290
6525991149,90cyclictest19840-21ntpq22:10:210
65259911414,85cyclictest18570-21awk00:10:290
6525991139,90cyclictest15430-21munin-run00:00:010
6525991139,89cyclictest6824-21seq21:17:530
65259911311,88cyclictest16970-21/usr/sbin/munin19:50:330
65259911310,89cyclictest17153-21ntp_states00:05:250
6525991129,89cyclictest2896-21ntpq21:00:210
6525991129,88cyclictest2504-21latency_hist23:10:010
6525991128,90cyclictest616-21users20:50:340
6525991128,88cyclictest26030-21/usr/sbin/munin20:25:260
6525991119,89cyclictest31082-21munin-run22:55:020
6525991118,88cyclictest27709-21/usr/sbin/munin20:30:250
6525991117,89cyclictest31295-21/usr/sbin/munin22:55:170
6525991117,89cyclictest24747-21/usr/sbin/munin20:20:130
65259911127,72cyclictest18624-21/usr/sbin/munin22:05:270
65259911113,86cyclictest269-21runrttasks21:13:410
1356021110,2sleep013559-21uptime23:50:300
6525991109,87cyclictest24806-21df22:30:130
6525991109,87cyclictest11940-21/usr/sbin/munin23:45:210
65259911031,68cyclictest27437-21/usr/sbin/munin22:40:160
65259911030,69cyclictest11390-21ntp_states21:35:250
6525991099,89cyclictest2927-21ntp_states23:10:250
6525991099,84cyclictest31338-21/usr/sbin/munin20:45:170
6525991098,89cyclictest2475-21munin-run21:00:010
6525991098,87cyclictest29798-21munin-run22:50:010
6525991098,87cyclictest19643-21idleruntime20:00:130
6525991098,86cyclictest22478-21ntp_states22:20:250
6525991097,90cyclictest14986-21users19:40:290
6525991097,88cyclictest9098-21/usr/sbin/munin23:35:130
6525991097,88cyclictest22883-21chrt20:11:370
6525991088,88cyclictest7987-21forks19:15:170
6525991088,87cyclictest24221-21sshd20:17:020
6525991088,87cyclictest21147-21ntp_states20:05:260
6525991087,87cyclictest15463-21seq21:54:180
6525991087,87cyclictest14671-21chrt21:48:370
6525991086,87cyclictest12325-21timerandwakeup19:30:300
65259910811,86cyclictest29187-21users20:35:290
6525991079,85cyclictest10457-21df23:40:130
6525991078,86cyclictest6901-21ntpq19:10:210
6525991078,86cyclictest22322-21/usr/sbin/munin00:25:220
6525991077,87cyclictest6789-21ntpq23:25:220
6525991077,87cyclictest20614-21munin-run00:20:010
6525991077,86cyclictest7811-21wc23:30:090
6525991076,87cyclictest23820-21sed00:30:290
65259910730,66cyclictest26559-21awk22:35:290
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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