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2026-05-26 - 22:24

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 100 highest latencies:
System rack2slot7s.osadl.org (updated Tue May 26, 2026 12:42:59)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1724672995945,9cyclictest0-21swapper/211:15:582
1724672995442,8cyclictest1-21systemd11:55:012
1724670995340,10cyclictest1784774-21munin-run09:40:010
1724672995037,10cyclictest1877739-21sshd11:35:052
1724672994841,3cyclictest0-21swapper/210:20:592
1724671994840,5cyclictest1842792-21find10:51:071
1724671994840,5cyclictest1729173-21munin-plugin-st07:25:001
1724671994741,3cyclictest0-21swapper/111:15:531
1724671994741,2cyclictest0-21swapper/108:10:591
1724672994636,5cyclictest0-21swapper/209:11:002
1724670994638,5cyclictest421-21dbus-daemon11:25:010
1724671994537,5cyclictest926102-21cups-browsed10:31:081
1724671994535,6cyclictest926102-21cups-browsed11:25:161
1724670994538,4cyclictest1897626-21munin-run12:00:000
1724670994534,8cyclictest1764787-21ssh09:15:010
1724672994435,5cyclictest1917824-21ssh12:25:012
1724671994434,8cyclictest420-21avahi-daemon09:25:021
1724671994432,8cyclictest1784788-21basename09:40:011
1724672994335,5cyclictest1813015-21latency_hist10:15:012
1724672994335,5cyclictest1813015-21latency_hist10:15:012
1724671994335,5cyclictest1853241-21cron11:05:011
1724671994335,5cyclictest1853241-21cron11:05:011
1724671994335,5cyclictest1792814-21ssh09:50:011
1724671994335,5cyclictest1747183-21systemd-run08:25:011
1724672994233,7cyclictest421-21dbus-daemon07:40:012
1724671994234,5cyclictest1881467-21cron11:40:011
1724671994233,5cyclictest1742675-21systemd-run08:10:011
1724672994133,5cyclictest1776769-21systemd-run09:30:012
1724671994135,3cyclictest0-21swapper/110:20:011
1724671994131,7cyclictest926102-21cups-browsed09:43:251
1724670994129,9cyclictest1917798-21latency_hist12:25:030
1724672994032,5cyclictest1-21systemd11:45:022
1724672994031,4cyclictest0-21swapper/212:36:062
1724672994030,6cyclictest1055-21mta-sts-daemon09:51:232
1724671994033,4cyclictest1732079-21unixbench_singl07:31:111
1724671994032,5cyclictest1760722-21idleruntime-cro09:10:011
1724671994028,8cyclictest926102-21cups-browsed12:31:081
1724671994011,8cyclictest1896741-21ssh11:58:181
1724671994011,6cyclictest1760706-21diskmemload11:49:491
172467099403,30cyclictest1927315-21ssh12:36:070
1724670994031,7cyclictest1742657-21cut08:10:000
172467099401,13cyclictest0-21swapper/007:31:040
1724672993931,5cyclictest1873465-21systemd-run11:30:012
1724672993931,5cyclictest1778720-21unixbench_multi09:31:112
1724671993933,3cyclictest0-21swapper/109:35:011
1724671993931,5cyclictest1812978-21systemd-run10:15:011
1724671993931,5cyclictest1812978-21systemd-run10:15:011
1724671993926,9cyclictest926102-21cups-browsed10:20:531
1724672993831,4cyclictest1875430-21sed11:31:102
1724672993829,5cyclictest1745671-21basename08:20:012
1724671993830,5cyclictest1841349-21latency_hist10:50:031
1724671993829,6cyclictest420-21avahi-daemon10:05:041
1724671993829,6cyclictest420-21avahi-daemon10:05:041
1724671993828,7cyclictest695-21cron09:55:011
1724671993828,7cyclictest1929874-21sh12:40:011
1724671993824,10cyclictest926102-21cups-browsed10:56:041
1724671993811,9cyclictest1907157-21ntpq12:11:031
1724670993831,4cyclictest1921884-21latency_hist12:30:020
1724670993816,6cyclictest171rcu_preempt10:26:320
1724672993730,4cyclictest1800845-21munin-run10:00:012
1724672993729,5cyclictest1-21systemd10:50:012
1724672993728,6cyclictest926102-21cups-browsed08:40:022
1724672993728,5cyclictest1897626-21munin-run12:00:002
1724671993731,3cyclictest0-21swapper/110:05:011
1724671993731,3cyclictest0-21swapper/108:40:011
1724671993728,5cyclictest1734190-21fschecks_count07:40:501
1724671993723,9cyclictest1725518-21ntpq07:10:561
1724670993728,7cyclictest1056-21mta-sts-daemon10:45:490
1724670993728,6cyclictest1751686-21systemd-run08:40:010
172467299366,25cyclictest1846501-21ssh10:55:592
1724672993629,3cyclictest0-21swapper/210:36:002
172467199368,10cyclictest1899123-21ntpq12:01:031
1724671993629,3cyclictest0-21swapper/110:00:011
1724671993628,5cyclictest1893576-21cron11:55:001
1724671993613,5cyclictest428-21mta-sts-daemon10:40:251
1724670993611,13cyclictest171rcu_preempt10:19:200
172467099360,10cyclictest14-21ksoftirqd/011:01:060
172467099360,10cyclictest14-21ksoftirqd/011:01:060
1724672993529,4cyclictest1724669-21cyclictest09:15:572
1724672993529,3cyclictest0-21swapper/211:01:022
1724672993529,3cyclictest0-21swapper/211:01:022
1724672993528,4cyclictest1857308-21systemd11:10:012
1724672993528,3cyclictest0-21swapper/208:51:062
1724672993527,5cyclictest1901686-21munin-plugin-st12:05:012
1724672993527,5cyclictest1790694-21unixbench-2d09:46:102
172467199353,25cyclictest1911103-21ssh12:15:591
1724671993529,3cyclictest0-21swapper/112:25:011
1724671993529,3cyclictest0-21swapper/110:40:011
1724671993528,4cyclictest1762332-21kworker/u8:15-xprtiod09:20:011
1724671993527,5cyclictest0-21swapper/109:14:591
1724671993523,7cyclictest926102-21cups-browsed11:10:131
1724670993524,2cyclictest171rcu_preempt11:16:010
1724670993521,7cyclictest1051-21mta-sts-daemon12:17:340
1724670993520,3cyclictest171rcu_preempt07:15:490
1724672993428,3cyclictest0-21swapper/209:41:012
1724672993428,3cyclictest0-21swapper/209:40:012
1724672993427,3cyclictest0-21swapper/212:16:052
1724672993426,5cyclictest1867302-21unixbench-2d11:21:102
1724672993425,6cyclictest421-21dbus-daemon10:05:492
1724672993425,6cyclictest421-21dbus-daemon10:05:492
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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