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2025-08-27 - 09:27

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 376 highest latencies:
System rack4slot6s.osadl.org (updated Wed Aug 27, 2025 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
844021420,3chrt8438-21irqstats19:40:170
2303621350,2sleep023035-21/usr/sbin/munin20:35:330
296821330,4chrt2969-21cat21:25:010
2830421310,3chrt28303-21/usr/sbin/munin20:55:300
2119721300,4chrt21198-21forks22:35:160
1600421300,3chrt16002-21df_inode22:15:140
993421230,2sleep09933-21uptime23:55:300
426991218,17cyclictest29024-21/usr/sbin/munin21:00:290
4269911811,92cyclictest13321-21munin-run20:00:010
426991176,14cyclictest18691-21/usr/sbin/munin20:20:330
426991166,19cyclictest9275-21cat23:55:010
3066821160,3sleep030671-21wc21:05:270
426991159,15cyclictest14653-21irqstats00:15:180
426991158,14cyclictest23772-21df22:45:130
426991157,92cyclictest32360-21chrt23:17:530
426991157,14cyclictest3448-21/usr/sbin/munin19:20:250
4269911510,15cyclictest14946-21memory20:05:210
426991149,92cyclictest11996-21df00:05:130
426991149,16cyclictest3484-21users23:30:290
426991149,14cyclictest14944-21ntp_states22:10:210
426991148,17cyclictest17418-21ntp_states00:25:250
426991148,15cyclictest6882-21/usr/sbin/munin23:45:210
426991148,14cyclictest22536-21/usr/sbin/munin22:40:210
426991147,16cyclictest20466-21chrt00:36:530
4269911410,90cyclictest25202-21df20:45:170
426991139,16cyclictest5674-21df_inode21:35:170
426991139,16cyclictest1227-21seq19:11:170
426991139,13cyclictest65372sleep019:32:250
426991137,14cyclictest7260-21/usr/sbin/munin21:40:290
426991136,13cyclictest30323-21/usr/sbin/munin23:10:210
4269911333,68cyclictest11057-21/usr/sbin/munin00:00:270
426991129,14cyclictest5350-21munin-run23:40:010
426991129,14cyclictest2994-21munin-run19:20:010
426991128,15cyclictest17968-21users20:15:330
426991128,14cyclictest845-21grep21:15:290
426991128,13cyclictest18457-21latency_hist22:25:010
426991127,15cyclictest10860-21idleruntime21:55:170
426991126,15cyclictest13311-21cut22:05:010
426991126,14cyclictest4415-21/usr/sbin/munin19:25:290
426991126,14cyclictest19181-21seq22:25:410
4269911210,89cyclictest20690-21seq20:26:250
4269911210,15cyclictest4915-21users21:30:290
426991119,14cyclictest20435-21users22:30:340
426991119,13cyclictest16854-21seq00:23:530
426991118,90cyclictest9765-21ntpq21:50:250
426991118,15cyclictest28500-21seq23:02:530
426991117,13cyclictest142212sleep000:13:410
426991117,12cyclictest23682sleep023:26:450
426991116,16cyclictest14652-21date20:05:010
426991116,13cyclictest26720-21ntp_states20:50:250
4269911131,69cyclictest13944-21/usr/sbin/munin22:05:300
426991107,13cyclictest170272chrt20:13:160
426991106,13cyclictest10497-21seq19:48:050
426991106,12cyclictest3141-21/usr/sbin/munin21:25:170
426991099,86cyclictest24205-21grep20:40:250
426991098,13cyclictest6181-21sshd23:41:140
426991098,12cyclictest7278-21ntp_states19:35:250
426991097,13cyclictest29761-21chrt23:07:420
426991096,14cyclictest8796-21users21:45:290
2500421090,3sleep025005-21/usr/sbin/munin22:50:130
426991088,89cyclictest10864-21/usr/sbin/munin19:50:290
426991088,87cyclictest21605-21ps20:30:250
426991087,15cyclictest18507-21/usr/sbin/munin00:30:170
426991087,13cyclictest32397-21chrt21:12:010
426991086,13cyclictest542-21sed23:20:250
426991086,13cyclictest26344-21runrttasks22:55:130
426991018,15cyclictest478-21latency_hist19:10:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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