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2026-05-12 - 02:09

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack4slot1s.osadl.org (updated Tue May 12, 2026 00:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
553521100,1sleep10-21swapper/121:37:381
124262950,5sleep012429-21head20:27:460
124262950,5sleep012429-21head20:27:460
306192940,2chrt30618-21awk22:42:450
306192940,2chrt30618-21awk22:42:450
306192940,2chrt30618-21awk22:42:450
256372820,3chrt0-21swapper/023:57:390
256372820,3chrt0-21swapper/023:57:390
318572780,3sleep131858-21sshd19:53:581
318572780,3sleep131858-21sshd19:53:581
255312620,3sleep30-21swapper/323:57:393
255312620,3sleep30-21swapper/323:57:393
110672590,2chrt281ktimers/120:27:271
110672590,2chrt281ktimers/120:27:271
110672590,2chrt281ktimers/120:27:271
211122580,2sleep00-21swapper/020:52:400
211122580,2sleep00-21swapper/020:52:400
187542570,2sleep118755-21cut20:47:331
38142530,3sleep10-21swapper/121:32:391
293652530,3sleep10-21swapper/122:42:301
293652530,3sleep10-21swapper/122:42:301
178552500,3sleep20-21swapper/222:11:002
178552500,3sleep20-21swapper/222:11:002
76172460,2sleep30-21swapper/321:42:423
76172460,2sleep30-21swapper/321:42:423
76172460,2sleep30-21swapper/321:42:423
216152450,3chrt0-21swapper/320:52:463
216152450,3chrt0-21swapper/320:52:463
98332440,3sleep30-21swapper/321:47:463
98332440,3sleep30-21swapper/321:47:463
271802440,3sleep20-21swapper/200:02:352
271802440,3sleep20-21swapper/200:02:352
271802440,3sleep20-21swapper/200:02:352
319772430,4sleep20-21swapper/221:22:352
319772430,4sleep20-21swapper/221:22:352
175772430,3sleep30-21swapper/320:42:423
175772430,3sleep30-21swapper/320:42:423
262582420,2sleep20-21swapper/222:32:382
262582420,2sleep20-21swapper/222:32:382
183022410,2sleep118301-21df_inode22:12:351
183022410,2sleep118301-21df_inode22:12:351
1566599393,29cyclictest27372-21/usr/sbin/munin00:02:360
1566599393,29cyclictest27372-21/usr/sbin/munin00:02:360
1566599393,29cyclictest27372-21/usr/sbin/munin00:02:360
200162350,4sleep30-21swapper/319:22:413
15666993428,4cyclictest23598-21latency_hist22:27:231
15666993428,4cyclictest23598-21latency_hist22:27:231
15666993425,7cyclictest0-21swapper/120:17:461
15666993425,7cyclictest0-21swapper/120:17:461
15665993427,5cyclictest27322-21idleruntime-cro22:37:230
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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