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2026-03-08 - 02:21

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, slot #7

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.
Unexpectedly long latencies may be caused by SMIs
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 792 highest latencies:
System rack2slot7s.osadl.org (updated Sat Mar 07, 2026 19:55:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1282983996856,7cyclictest2111611-21sh18:10:431
1282984996753,8cyclictest1521065-21od17:40:282
1282984995744,9cyclictest2112786-21sh18:10:472
1282982995547,5cyclictest2089712-21looper18:10:070
1282984995446,3cyclictest0-21swapper/217:50:362
1282984995439,11cyclictest1872851-21spawn18:04:252
1282984995344,6cyclictest2049876-21sh18:08:132
1282984995344,6cyclictest2049876-21sh18:08:132
1282983995138,3cyclictest171rcu_preempt18:09:561
1282983995138,3cyclictest171rcu_preempt18:09:561
1282982995143,5cyclictest1523538-21sh17:40:360
1282982994941,5cyclictest2046857-21sh18:08:060
1282982994941,5cyclictest2046857-21sh18:08:060
1282982994836,9cyclictest1596838-21Run17:59:030
1282982994831,13cyclictest1595176-21Run17:53:340
1282983994739,5cyclictest1550274-21multi.sh17:41:451
128298399471,38cyclictest1286712-21execl17:20:321
1282984994235,4cyclictest1593617-21execl17:50:022
1282984994235,4cyclictest1593617-21execl17:50:022
1282983994233,6cyclictest1593616-21execl17:50:021
1282983994233,6cyclictest1593616-21execl17:50:021
1282984994010,20cyclictest0-21swapper/218:30:322
128298399403,9cyclictest171rcu_preempt18:15:321
1282983994031,5cyclictest0-21swapper/117:50:261
1282982994033,5cyclictest1723581-21spawn18:03:160
1282983993931,5cyclictest1760831-21spawn18:03:271
1282984993830,5cyclictest1515194-21sh17:40:012
128298499371,32cyclictest1286712-21execl17:20:332
1282983993729,5cyclictest1284802-21systemd-run17:15:011
1282983993729,5cyclictest1284802-21systemd-run17:15:011
128298299371,30cyclictest1288136-21fstime17:25:370
1282984993627,6cyclictest3606335-21systemd-logind17:10:012
1282983993527,5cyclictest1286464-21munin-run17:20:001
1282984993325,5cyclictest1289344-21timerwakeupswit17:25:462
1282983993324,6cyclictest1480708-21systemd-run17:35:001
1282983993319,9cyclictest564-21dbus-daemon17:57:011
128298399330,30cyclictest1481615-21syscall17:35:301
1282982993322,9cyclictest2162909-21cron18:20:010
1282982993318,12cyclictest2166446-21fschecks_time18:30:210
1282982993317,13cyclictest0-21swapper/017:49:490
1282982993317,13cyclictest0-21swapper/017:49:490
128298499326,16cyclictest1168-21mta-sts-daemon18:15:292
128298499322,24cyclictest1596879-21Run17:59:292
128298399322,8cyclictest0-21swapper/117:28:591
1282982993225,4cyclictest1480708-21systemd-run17:35:000
128298299320,29cyclictest0-21swapper/018:20:340
1282984993117,9cyclictest1284069-21ntpq17:10:222
1282984993117,9cyclictest1284069-21ntpq17:10:222
128298499311,25cyclictest763-21snmpd17:15:282
1282982993119,2cyclictest0-21swapper/017:40:010
1282983993025,4cyclictest1282981-21cyclictest18:35:391
1282982993014,12cyclictest12450irq/32-eth017:20:360
128298599294,4cyclictest0-21swapper/317:35:283
1282984992923,3cyclictest0-21swapper/218:40:012
1282984992922,4cyclictest1375456-21spawn17:34:072
128298299299,16cyclictest151ktimers/018:25:280
128298299292,6cyclictest171rcu_preempt17:10:270
128298299292,6cyclictest171rcu_preempt17:10:270
1282982992823,2cyclictest0-21swapper/017:20:000
1282982992822,3cyclictest0-21swapper/018:40:020
128298599272,6cyclictest0-21swapper/317:57:023
128298599272,5cyclictest0-21swapper/317:10:013
1282984992721,3cyclictest0-21swapper/218:25:372
1282984992715,8cyclictest2163878-21ntpq18:20:312
1282983992721,3cyclictest0-21swapper/117:10:011
1282983992719,5cyclictest1167-21mta-sts-daemon18:20:391
128298599252,8cyclictest0-21swapper/317:53:343
128298599252,7cyclictest0-21swapper/318:10:423
128298599252,10cyclictest0-21swapper/318:09:003
128298599252,10cyclictest0-21swapper/318:09:003
128298399252,18cyclictest763-21snmpd18:30:331
1282984992413,8cyclictest1282994-21munin-run17:05:012
128298599233,4cyclictest0-21swapper/317:40:333
128298599232,6cyclictest0-21swapper/318:00:483
128298599223,4cyclictest0-21swapper/318:30:263
1282983992214,5cyclictest1-21systemd18:30:021
128298599183,6cyclictest0-21swapper/318:25:293
1282983991812,3cyclictest0-21swapper/117:05:011
1282982991812,4cyclictest0-21swapper/017:05:010
128298599172,7cyclictest0-21swapper/317:25:333
128298599172,7cyclictest0-21swapper/317:15:313
128298299179,5cyclictest12450irq/32-eth017:08:070
128298599162,7cyclictest0-21swapper/317:45:283
128298599162,7cyclictest0-21swapper/317:45:283
128298599143,6cyclictest0-21swapper/317:20:373
128298599135,5cyclictest0-21swapper/317:30:343
128298599121,6cyclictest0-21swapper/318:35:313
128298599102,4cyclictest0-21swapper/318:20:313
128298599101,5cyclictest0-21swapper/318:15:183
12829859993,4cyclictest0-21swapper/317:10:203
12829859993,4cyclictest0-21swapper/317:10:203
12829859992,6cyclictest0-21swapper/317:05:013
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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