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2026-08-15 - 08:43

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 Sat Aug 15, 2026 00:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
72792980,2sleep10-21swapper/120:24:011
239382760,1sleep124044-21/usr/sbin/munin21:09:011
193822700,2sleep00-21swapper/023:49:040
176092650,1chrt17610-21sed22:18:511
176092650,1chrt17610-21sed22:18:511
136482570,7sleep113650-21switchtime20:39:131
136482570,7sleep113650-21switchtime20:39:131
25222540,2chrt2523-21/usr/sbin/munin00:29:110
150712530,1sleep115182-21sed20:44:041
10202530,2sleep11122-21gzip22:59:081
10202530,2sleep11122-21gzip22:59:081
10202530,2sleep11122-21gzip22:59:081
235602460,2sleep30-21swapper/319:39:093
235602460,2sleep30-21swapper/319:39:093
279762450,3sleep30-21swapper/322:44:103
321932430,3sleep20-21swapper/221:29:082
12522430,2sleep10-21swapper/120:08:501
135582420,2sleep013645-21switchtime20:39:130
135582420,2sleep013645-21switchtime20:39:130
6362410,3sleep30-21swapper/322:59:013
6362410,3sleep30-21swapper/322:59:013
6362410,3sleep30-21swapper/322:59:013
239942410,2sleep00-21swapper/022:34:050
239942410,2sleep00-21swapper/022:34:050
117862400,3sleep30-21swapper/320:34:083
304722380,3sleep30-21swapper/321:24:093
304722380,3sleep30-21swapper/321:24:093
252772370,3sleep30-21swapper/319:44:073
133642370,3sleep30-21swapper/322:04:133
212012360,1sleep121360-21unixbench_multi20:59:121
212012360,1sleep121360-21unixbench_multi20:59:121
13890993624,4cyclictest181rcu_preempt00:00:351
13890993624,4cyclictest181rcu_preempt00:00:351
13890993624,4cyclictest181rcu_preempt00:00:351
13889993611,5cyclictest201rcuc/022:02:000
13889993611,5cyclictest201rcuc/022:02:000
13889993611,5cyclictest201rcuc/022:02:000
120702360,2sleep20-21swapper/222:03:562
120702360,2sleep20-21swapper/222:03:562
120702360,2sleep20-21swapper/222:03:562
61952350,2sleep06355-21cat23:14:020
1389399352,23cyclictest24544-21chrt00:03:533
1389399352,23cyclictest24544-21chrt00:03:533
1389399352,23cyclictest24544-21chrt00:03:533
13889993526,7cyclictest25230-21netstat19:44:060
154852340,3chrt0-21swapper/320:44:093
13890993426,6cyclictest31564-21fschecks_count21:29:001
13890993426,6cyclictest18469-21fschecks_count20:54:021
13890993421,2cyclictest181rcu_preempt00:14:001
13890993415,6cyclictest281ktimers/100:29:101
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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