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2026-05-31 - 07:21

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 Sun May 31, 2026 00:44:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
272342910,2sleep027235-21ps20:28:010
272342910,2sleep027235-21ps20:28:010
43902750,3sleep20-21swapper/223:47:542
43902750,3sleep20-21swapper/223:47:542
166002740,3chrt0-21swapper/221:27:522
161352720,2sleep30-21swapper/319:58:013
56782670,3sleep20-21swapper/219:32:432
56782670,3sleep20-21swapper/219:32:432
56782670,3sleep20-21swapper/219:32:432
30322590,1sleep00-21swapper/019:23:000
30322590,1sleep00-21swapper/019:23:000
129292550,3chrt0-21swapper/221:17:552
129292550,3chrt0-21swapper/221:17:552
197222530,3sleep20-21swapper/223:02:512
197222530,3sleep20-21swapper/223:02:512
121412530,4chrt0-21swapper/222:42:452
121412530,4chrt0-21swapper/222:42:452
209682510,4sleep2351rcuc/221:37:572
209682510,4sleep2351rcuc/221:37:572
209682510,4sleep2351rcuc/221:37:572
115522480,3sleep20-21swapper/221:12:572
115522480,3sleep20-21swapper/221:12:572
287762460,3sleep20-21swapper/220:32:532
287762460,3sleep20-21swapper/220:32:532
31116994323,15cyclictest10093-21fw_packets00:02:530
31116994323,15cyclictest10093-21fw_packets00:02:530
3111699412,33cyclictest9761-21/usr/sbin/munin00:02:510
210442410,3sleep00-21swapper/021:37:590
210442410,3sleep00-21swapper/021:37:590
210442410,3sleep00-21swapper/021:37:590
3111899383,29cyclictest9693-21grep00:02:461
3111899383,29cyclictest9693-21grep00:02:461
31118993829,7cyclictest15386-21netstat21:22:591
31118993829,7cyclictest15386-21netstat21:22:591
31118993829,7cyclictest15386-21netstat21:22:591
31116993815,4cyclictest201rcuc/000:25:490
31116993815,4cyclictest201rcuc/000:25:490
31116993815,4cyclictest201rcuc/000:25:490
150762380,2sleep015221-21cat22:48:030
150762380,2sleep015221-21cat22:48:030
3111899371,29cyclictest10282-21/usr/sbin/munin00:02:541
3111899371,29cyclictest10282-21/usr/sbin/munin00:02:541
31116993731,4cyclictest201rcuc/020:46:340
31116993731,4cyclictest201rcuc/020:46:340
31116993731,4cyclictest201rcuc/020:46:340
31116993714,6cyclictest201rcuc/000:00:330
91192360,3sleep30-21swapper/321:07:513
91192360,3sleep30-21swapper/321:07:513
91192360,3sleep30-21swapper/321:07:513
31116993615,18cyclictest201rcuc/020:14:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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