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2026-04-18 - 06:49
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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 100 highest latencies:
System rackbslot7.osadl.org (updated Sat Apr 18, 2026 00:44:28)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1666991132,83cyclictest8284-21apt-get22:48:180
1686999949,10cyclictest181rcu_preempt22:04:112
95929811,61sleep21012-21cat18:58:422
1686999716,51cyclictest9055-21diskmemload21:33:172
1686999716,51cyclictest9055-21diskmemload21:33:172
168699962,76cyclictest8284-21apt-get22:48:122
1686999537,24cyclictest9844-21ssh21:03:232
1686999444,12cyclictest181rcu_preempt00:24:042
166699942,66cyclictest31997-21kworker/u18:0+ext4-rsv-conversion22:03:260
1678999331,39cyclictest1657-21cyclictest21:08:331
1678999331,39cyclictest1657-21cyclictest21:08:331
1678998967,14cyclictest9055-21diskmemload00:18:011
118192890,7sleep00-21swapper/023:48:050
118192890,7sleep00-21swapper/023:48:050
1686998819,31cyclictest0-21swapper/219:38:012
166699882,69cyclictest27985-21ssh21:33:340
166699882,69cyclictest27985-21ssh21:33:340
1686998761,18cyclictest1119-21latency_hist21:43:002
1686998753,12cyclictest181rcu_preempt23:44:072
1686998746,8cyclictest181rcu_preempt23:48:292
1686998746,8cyclictest181rcu_preempt23:48:292
1666998764,14cyclictest18998-21ssh21:18:280
1666998764,14cyclictest18998-21ssh21:18:280
1666998756,22cyclictest277-21dbus-daemon23:27:570
166699872,75cyclictest2848-21kworker/u18:2+flush-179:019:18:230
1686998663,15cyclictest2374-21systemd-journal19:39:462
1666998669,11cyclictest300-21rs:main0
1666998654,8cyclictest181rcu_preempt19:36:560
1666998640,15cyclictest7277-21latency_hist19:18:010
1666998547,26cyclictest24709-21ssh21:28:280
1686998458,7cyclictest181rcu_preempt00:16:042
1686998444,8cyclictest181rcu_preempt20:43:232
1686998443,11cyclictest297-21systemd-logind21:03:002
1686998442,12cyclictest181rcu_preempt21:23:292
1686998442,12cyclictest181rcu_preempt21:23:292
166699843,32cyclictest15-21ksoftirqd/023:03:560
1686998356,9cyclictest181rcu_preempt22:38:282
1686998344,12cyclictest181rcu_preempt23:14:242
1678998368,10cyclictest1657-21cyclictest22:34:241
1666998358,7cyclictest181rcu_preempt23:15:140
1686998267,8cyclictest6535-21ntpq23:38:252
1686998267,8cyclictest6535-21ntpq23:38:252
1686998245,8cyclictest181rcu_preempt19:28:292
166699822,66cyclictest30529-21kworker/u18:1+ext4-rsv-conversion19:23:230
166699822,66cyclictest30529-21kworker/u18:1+ext4-rsv-conversion19:23:230
1686998161,13cyclictest2374-21systemd-journal23:07:082
1686998153,21cyclictest15225-21if_err_eth023:53:222
1686998152,20cyclictest11673-21ssh22:53:212
1686998144,11cyclictest181rcu_preempt00:03:192
1686998143,10cyclictest181rcu_preempt21:46:212
1678998164,10cyclictest9557-21sh23:43:291
1678998162,13cyclictest9917-21netstat21:03:251
1678998161,14cyclictest17576-21unixbench_multi22:08:341
1678998161,14cyclictest17576-21unixbench_multi22:08:341
1666998164,10cyclictest16456-21ssh22:08:010
1666998164,10cyclictest16456-21ssh22:08:010
1666998118,29cyclictest15-21ksoftirqd/022:23:330
168699806,63cyclictest9228-21apt-get19:23:322
168699806,63cyclictest9228-21apt-get19:23:322
1686998052,9cyclictest181rcu_preempt22:23:152
1686998046,13cyclictest181rcu_preempt19:18:552
1678998056,18cyclictest5259-21idleruntime-cro19:12:571
1666998061,13cyclictest30490-21sh00:18:320
105742800,6sleep09055-21diskmemload21:58:190
1686997956,9cyclictest181rcu_preempt23:21:042
1686997956,9cyclictest181rcu_preempt23:21:042
1686997947,10cyclictest181rcu_preempt19:53:012
1686997942,12cyclictest181rcu_preempt20:13:012
1686997922,21cyclictest0-21swapper/221:48:132
1678997964,10cyclictest1657-21cyclictest20:46:461
1678997918,23cyclictest14781-21sort19:38:311
1678997918,22cyclictest29110-21fschecks_time20:23:201
1666997953,7cyclictest181rcu_preempt21:23:520
1666997953,7cyclictest181rcu_preempt21:23:520
1686997859,13cyclictest21163-21mailstats19:58:302
1686997842,9cyclictest181rcu_preempt00:02:562
1686997842,8cyclictest181rcu_preempt20:28:012
1686997841,14cyclictest181rcu_preempt21:08:142
1686997841,14cyclictest181rcu_preempt21:08:142
1686997833,13cyclictest181rcu_preempt19:53:192
1686997819,33cyclictest0-21swapper/221:15:382
1678997819,19cyclictest19539-21ssh22:13:071
1678997816,25cyclictest28080-21sh21:33:501
1678997816,25cyclictest28080-21sh21:33:501
166699783,50cyclictest15-21ksoftirqd/023:53:380
1666997818,31cyclictest15-21ksoftirqd/000:03:170
1686997745,11cyclictest181rcu_preempt22:43:322
1686997741,18cyclictest181rcu_preempt23:23:282
1686997740,8cyclictest181rcu_preempt22:01:552
1686997722,22cyclictest0-21swapper/223:37:552
1678997757,14cyclictest19354-21timerwakeupswit21:18:341
1678997757,14cyclictest19354-21timerwakeupswit21:18:341
1678997720,18cyclictest17194-21latency_hist19:48:001
1666997760,10cyclictest15064-21systemctl21:12:570
1666997760,10cyclictest15064-21systemctl21:12:570
1666997750,11cyclictest181rcu_preempt21:39:040
1666997749,7cyclictest181rcu_preempt00:31:420
1666997749,20cyclictest26721-21latency_hist00:13:010
1686997646,13cyclictest181rcu_preempt19:08:322
1686997643,7cyclictest181rcu_preempt22:37:462
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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