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2026-08-02 - 02:32

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 here to display the system's profile data or here to proceed to next system.
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 100 highest latencies:
System rack2slot7s.osadl.org (updated Sun Aug 02, 2026 00:43:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1587611996341,13cyclictest12650irq/32-eth023:00:550
1587611995437,5cyclictest1712972-21aten_r2power_fr23:35:410
1587613995344,6cyclictest1720067-21switchtime23:46:062
1587613995344,6cyclictest1720067-21switchtime23:46:062
1587612995343,6cyclictest1-21systemd23:10:021
1587611995312,33cyclictest1640139-21ssh21:35:510
1587611995140,5cyclictest0-21swapper/021:30:480
1587611995135,13cyclictest1596719-21latency_hist19:40:020
1587611995135,13cyclictest1596719-21latency_hist19:40:020
158761199502,39cyclictest1707521-21ssh23:25:510
158761199502,39cyclictest1707521-21ssh23:25:510
1587611995022,21cyclictest151ktimers/022:30:550
1587613994940,6cyclictest1587616-21systemd-run19:10:012
1587611994941,5cyclictest421-21dbus-daemon19:25:010
1587613994739,4cyclictest0-21swapper/200:00:022
1587613994635,8cyclictest420-21avahi-daemon19:20:022
1587613994624,18cyclictest1689478-21timerandwakeup22:56:002
1587613994623,20cyclictest0-21swapper/220:25:012
158761399461,37cyclictest1621478-21ntpq21:00:522
1587611994639,4cyclictest1623621-21systemd-run21:10:020
1587613994540,2cyclictest0-21swapper/219:40:002
1587613994540,2cyclictest0-21swapper/219:40:002
1587613994538,4cyclictest1678795-21munin-plugin-st22:40:012
1587613994538,4cyclictest1678795-21munin-plugin-st22:40:012
158761399451,36cyclictest1594470-21ntpq19:30:472
1587611994531,11cyclictest1654315-21sendmail22:00:010
1587611994529,13cyclictest1590649-21latency_hist19:20:020
1587612994436,5cyclictest1589116-21systemd-run19:15:011
1587612994432,7cyclictest0-21swapper/122:05:521
1587611994436,5cyclictest1684934-21latency_hist22:50:010
158761199442,38cyclictest1630912-21ssh21:20:510
1587613994334,6cyclictest1624066-21aten_r2power_cu21:10:402
158761399432,36cyclictest1601951-21ntpq19:55:522
158761399431,38cyclictest1713686-21ntpq23:35:552
158761399431,38cyclictest1622989-21ntpq21:05:542
1587612994334,6cyclictest1630738-21missed_timers21:20:461
1587611994335,5cyclictest1739968-21ssh00:20:010
1587611994322,8cyclictest420-21avahi-daemon00:14:430
1587611994322,8cyclictest420-21avahi-daemon00:14:430
1587613994225,13cyclictest0-21swapper/223:26:012
1587613994225,13cyclictest0-21swapper/223:26:012
158761399422,34cyclictest1606494-21ntpq20:10:532
1587613994220,19cyclictest0-21swapper/221:40:432
1587613994219,20cyclictest4072527-21cups-browsed22:32:412
158761399421,36cyclictest1615459-21ntpq20:40:502
158761399421,36cyclictest1590839-21sshd19:20:302
158761399421,35cyclictest1619984-21ntpq20:55:502
158761399421,34cyclictest1599031-21ntpq19:45:512
158761399421,34cyclictest1592961-21ntpq19:25:482
1587612994216,12cyclictest1623594-21diskmemload00:11:091
1587612994216,12cyclictest1623594-21diskmemload00:11:091
1587612994212,17cyclictest0-21swapper/119:40:491
1587612994212,17cyclictest0-21swapper/119:40:491
158761199425,30cyclictest1710657-21ssh23:30:560
1587613994132,4cyclictest0-21swapper/200:30:542
158761399412,5cyclictest171rcu_preempt00:20:522
158761399412,33cyclictest1618497-21ntpq20:50:512
158761399411,35cyclictest1734979-21ntpq00:10:492
158761399411,35cyclictest1734979-21ntpq00:10:492
158761399411,35cyclictest1732078-21ntpq00:05:592
158761399411,35cyclictest1732078-21ntpq00:05:592
158761399411,34cyclictest1613946-21ntpq20:35:462
158761399411,34cyclictest1613946-21ntpq20:35:462
1587613994112,13cyclictest1623594-21diskmemload21:19:472
1587612994133,5cyclictest1727706-21ssh00:00:011
158761399403,32cyclictest1729045-21ntpq00:00:592
158761399401,36cyclictest1600260-21/usr/sbin/munin19:50:492
158761399401,36cyclictest1597550-21ntpq19:40:552
158761399401,36cyclictest1597550-21ntpq19:40:552
158761399401,34cyclictest1639699-21/usr/sbin/munin21:35:422
158761399401,34cyclictest1611064-21ntpq20:25:522
158761299402,29cyclictest1649438-21diskmemload21:50:541
1587612994013,7cyclictest1663321-21ssh22:14:371
1587611994027,8cyclictest0-21swapper/000:20:490
158761399392,32cyclictest1658624-21ntpq22:05:572
158761399391,35cyclictest1711044-21/usr/sbin/munin23:31:022
158761399391,34cyclictest1637017-21ntpq21:30:472
158761399391,34cyclictest1631582-21ssh21:21:092
158761399391,34cyclictest1588507-21ntpq19:10:492
158761399390,34cyclictest1654734-21ssh22:00:342
158761299391,29cyclictest1670686-21ssh22:25:501
1587611993932,4cyclictest1687954-21cron22:55:000
1587611993932,4cyclictest1610182-21latency_hist20:25:020
1587611993930,4cyclictest0-21swapper/019:50:510
1587611993918,15cyclictest151ktimers/022:35:520
1587611993918,15cyclictest151ktimers/022:35:520
1587613993831,4cyclictest1739979-21sendmail00:20:012
158761399382,32cyclictest1612479-21ntpq20:30:512
158761399382,32cyclictest1612479-21ntpq20:30:512
158761399381,34cyclictest1750282-21ntpq00:35:512
158761399381,34cyclictest1679895-21ntpq22:40:482
158761399381,34cyclictest1679895-21ntpq22:40:482
158761399381,34cyclictest1664628-21ntpq22:15:512
158761399381,34cyclictest1616635-21fw_packets20:45:442
158761399381,34cyclictest1603456-21ntpq20:00:492
158761399381,33cyclictest1686147-21ntpq22:50:552
158761399381,31cyclictest1633125-21ssh21:25:122
1587612993829,6cyclictest1643786-21unixbench_multi21:41:011
1587612993822,11cyclictest1624314-21diskstats21:10:441
1587612993817,12cyclictest1627868-21ssh21:15:541
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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