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2025-11-19 - 22:40
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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 50 highest latencies:
System rackeslot6.osadl.org (updated Wed Nov 19, 2025 12:44:52)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
16986919910392,8cyclictest1747417-21latency_hist09:40:001
1698691999282,8cyclictest1711867-21/usr/sbin/munin07:50:231
1698691999282,7cyclictest1805470-21latency_hist12:40:011
1698691998880,4cyclictest1698646-21kworker/u8:2+flush-179:007:20:011
1698687998876,9cyclictest271-21systemd-journal11:50:280
1698691998774,9cyclictest1779513-21latency_hist11:20:011
1698687998780,6cyclictest1747441-21kworker/u8:3+flush-179:009:45:310
1698687998273,7cyclictest271-21systemd-journal07:40:000
1698691997973,4cyclictest1744470-21kworker/u8:2+flush-179:010:15:001
1698687997868,7cyclictest1779745-21/usr/sbin/munin11:20:270
1698687997565,8cyclictest1719839-21latency_hist08:15:000
1698687997563,10cyclictest1714814-21apt-get07:59:590
1698691997366,5cyclictest1710080-21kworker/u8:1+events_unbound08:25:241
1698687997363,8cyclictest1774967-21/usr/sbin/munin11:05:290
1698687997363,8cyclictest1774967-21/usr/sbin/munin11:05:280
1698687997261,8cyclictest1737609-21latency_hist09:10:000
1698687997160,8cyclictest1782675-21latency_hist11:30:010
1698687997060,8cyclictest1700196-21latency_hist07:15:010
1698691996962,4cyclictest1747441-21kworker/u8:3+flush-179:009:50:261
169869399680,65cyclictest0-21swapper/207:38:592
1698691996861,5cyclictest1782709-21kworker/u8:1+events_unbound11:40:001
1698687996858,7cyclictest1763584-21latency_hist10:30:010
1698691996760,5cyclictest1774298-21kworker/u8:2+flush-179:011:10:181
1698698996664,1cyclictest0-21swapper/307:38:593
1698687996658,7cyclictest1729693-21kworker/u8:3+flush-179:009:00:010
1698691996560,4cyclictest1802282-21kworker/u8:2+events_unbound12:30:001
1698687996559,5cyclictest1768400-21kworker/u8:3+flush-179:010:50:260
1698687996357,4cyclictest1755653-21kworker/u8:3+flush-179:010:05:000
1698687996354,7cyclictest1787454-21latency_hist11:45:010
1698693996258,2cyclictest0-21swapper/211:00:592
1698691996256,4cyclictest1777932-21kworker/u8:0+flush-179:012:15:001
1698691996252,8cyclictest1795662-21latency_hist12:10:011
1698691996154,5cyclictest1739432-21/usr/sbin/munin09:15:291
1698691996054,4cyclictest1788489-21kworker/u8:1+flush-179:011:45:251
1698691996054,4cyclictest1729693-21kworker/u8:3+flush-179:008:55:291
1698687996054,4cyclictest1736001-21kworker/u8:0+events_unbound09:10:270
1698687996054,4cyclictest1714861-21kworker/u8:3+flush-179:008:05:150
1698687996054,4cyclictest1714861-21kworker/u8:3+flush-179:008:05:150
1698691995952,5cyclictest1737864-21apt-get09:10:131
1698687995952,5cyclictest271-21systemd-journal10:50:010
1698698995854,2cyclictest0-21swapper/311:00:593
1698691995854,3cyclictest1729693-21kworker/u8:3+flush-179:009:24:551
1698687995853,4cyclictest1747441-21kworker/u8:3+flush-179:009:45:000
1698691995752,4cyclictest1774298-21kworker/u8:2+events_unbound11:25:301
1698687995748,6cyclictest1788489-21kworker/u8:1+events_unbound12:10:190
1698691995649,4cyclictest1788489-21kworker/u8:1+flush-179:012:30:191
1698687995650,4cyclictest1718288-21kworker/u8:2+flush-179:008:20:000
1698687995646,7cyclictest1710045-21latency_hist07:45:010
1698687995544,9cyclictest1721963-21apt-get08:20:130
1698691995446,6cyclictest1742623-21/usr/sbin/munin09:25:251
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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