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2025-11-17 - 12:19

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #b, slot #5

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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  Phytec
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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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackbslot5s.osadl.org (updated Mon Nov 17, 2025 00:44:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2459087995034,12cyclictest121ktimers/023:55:150
245908799471,12cyclictest24911012/usr/sbin/munin20:40:170
2459092994638,5cyclictest2487327-21cron20:30:011
2459087994637,5cyclictest2463037-21idleruntime-cro19:20:000
2459101994538,4cyclictest2573472-21munin-plugin-st00:40:003
2459087994533,9cyclictest121ktimers/000:30:180
2459101994332,7cyclictest2509677-21grep21:30:273
2459096994335,4cyclictest2466682-21latency_hist19:30:002
2459092994334,6cyclictest299-21systemd-logind22:52:321
245908799431,9cyclictest2475621-21/usr/sbin/munin19:55:130
2459087994318,20cyclictest2545970-21ls23:20:000
245908799431,13cyclictest2473683-21cron19:50:010
2459101994232,6cyclictest2487345-21basename20:30:013
2459092994233,6cyclictest2490739-21sh20:40:011
2459092994233,5cyclictest2552997-21grep23:40:001
2459092994222,7cyclictest2509832-21kworker/u8:0+events_unbound21:40:171
2459087994232,6cyclictest2508044-21grep21:25:280
245908799421,9cyclictest2532835-21/usr/sbin/munin22:40:170
245908799421,8cyclictest2469496-21/usr/sbin/munin19:35:250
245908799421,11cyclictest2540439-21unixbench_singl23:00:280
245908799421,11cyclictest2537666-21/usr/sbin/munin22:55:140
245908799413,6cyclictest2528920-21munin-plugin-st22:30:000
245908799412,34cyclictest2475396-21awk19:55:010
245908799411,9cyclictest2524933-21/usr/sbin/munin22:15:270
245908799411,9cyclictest2518283-21/usr/sbin/munin21:55:300
245908799411,9cyclictest2460805-21cat19:15:010
245908799411,8cyclictest2543076-21/usr/sbin/munin23:10:200
245908799411,8cyclictest2509403-21/usr/sbin/munin21:30:250
245908799411,8cyclictest2498709-21/usr/sbin/munin21:00:250
245908799411,6cyclictest2554283-21grep23:40:260
245908799411,11cyclictest2486799-21sed20:25:280
245908799410,10cyclictest2565165-21apt-get00:15:150
2459092994028,8cyclictest2496070-21auditctl20:55:011
2459087994028,8cyclictest2548929-21grep23:25:270
2459087994028,8cyclictest2548929-21grep23:25:270
245908799402,7cyclictest2572733-21runrttasks00:35:290
245908799402,6cyclictest2569901-21sshd00:28:160
245908799402,6cyclictest2569901-21sshd00:28:160
245908799402,15cyclictest2483908-21cron20:20:010
245908799401,9cyclictest2505057-21apt-get21:20:070
245908799401,7cyclictest2499726-21/usr/sbin/munin21:05:130
245908799401,6cyclictest2526020-21/usr/sbin/munin22:20:170
245908799401,6cyclictest2526020-21/usr/sbin/munin22:20:170
245908799401,6cyclictest2488691-21cron20:31:000
245908799400,4cyclictest2496307-21taskset20:55:120
2459092993931,4cyclictest2542564-21idleruntime-cro23:10:001
2459092993929,6cyclictest2567951-21grep00:20:291
245908799397,27cyclictest2520627-21apt-get22:05:170
245908799393,6cyclictest2561930-21cut00:05:180
245908799391,9cyclictest2481821-21users20:10:280
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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