OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of system in rack #e, slot #6

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 50 highest latencies:

System rackeslot6.osadl.org (updated Sun Dec 07, 2025 12:44:53)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
1775510	99	95	90,4	cyclictest	1874108	-21	kworker/u8:3+events_unbound	12:35:24	1
1775510	99	95	85,7	cyclictest	1836932	-21	latency_hist	10:20:00	1
1775510	99	93	89,3	cyclictest	1780433	-21	kworker/u8:2+events_unbound	07:35:25	1
1775510	99	93	83,7	cyclictest	1856060	-21	latency_hist	11:20:01	1
1775510	99	90	68,20	cyclictest	1814174	-21	kworker/u8:2+flush-179:0	09:40:00	1
1775510	99	86	82,3	cyclictest	1800068	-21	kworker/u8:0+events_unbound	08:30:23	1
1775510	99	85	81,3	cyclictest	1777037	-21	kworker/u8:0+events_unbound	07:25:24	1
1775508	99	85	74,8	cyclictest	1882569	-21	latency_hist	12:40:01	0
1775508	99	84	73,7	cyclictest	1	-21	systemd	07:15:00	0
1775510	99	78	69,3	cyclictest	1872737	-21	kworker/u8:2+events_unbound	12:20:21	1
1775510	99	76	66,7	cyclictest	1816264	-21	journal-offline	09:15:13	1
1775510	99	76	64,10	cyclictest	1880717	-21	apt-get	12:35:00	1
1775510	99	73	58,13	cyclictest	1815757	-21	http	09:15:01	1
1775510	99	73	58,13	cyclictest	1815757	-21	http	09:15:01	1
1775508	99	73	67,4	cyclictest	1852895	-21	kworker/u8:2+events_unbound	11:20:01	0
1775510	99	72	61,8	cyclictest	1827130	-21	latency_hist	09:50:01	1
1775508	99	72	63,7	cyclictest	1861087	-21	apt-get	11:34:59	0
1775510	99	71	67,3	cyclictest	1786739	-21	kworker/u8:1+events_unbound	08:20:14	1
1775510	99	71	67,3	cyclictest	1780433	-21	kworker/u8:2+events_unbound	07:30:21	1
1775510	99	71	55,7	cyclictest	1840124	-21	latency_hist	10:30:01	1
1775508	99	71	61,8	cyclictest	1847038	-21	kworker/u8:1+flush-179:0	11:25:23	0
1775510	99	70	60,8	cyclictest	1806435	-21	/usr/sbin/munin	08:45:23	1
1775508	99	69	0,66	cyclictest	723	-21	Xorg	11:44:59	0
1775510	99	68	64,3	cyclictest	1877558	-21	kworker/u8:0+events_unbound	12:25:16	1
1775508	99	68	48,18	cyclictest	1830580	-21	apt-get	10:00:12	0
1775510	99	67	61,5	cyclictest	1840129	-21	kworker/u8:2+flush-179:0	10:35:27	1
1775510	99	67	59,3	cyclictest	1786739	-21	kworker/u8:1+events_unbound	08:00:15	1
1775510	99	67	59,3	cyclictest	1786739	-21	kworker/u8:1+events_unbound	08:00:15	1
1775510	99	67	56,8	cyclictest	1786595	-21	apt-get	07:45:01	1
1775510	99	66	58,6	cyclictest	1874073	-21	apt-get	12:15:00	1
1775510	99	65	60,4	cyclictest	1840129	-21	kworker/u8:2+events_unbound	10:45:13	1
1775515	99	64	0,62	cyclictest	0	-21	swapper/3	12:25:59	3
1775510	99	64	59,4	cyclictest	1777037	-21	kworker/u8:0+events_unbound	07:22:15	1
1775510	99	64	54,4	cyclictest	1823984	-21	kworker/u8:1+events_unbound	10:07:14	1
1775510	99	64	53,9	cyclictest	1828973	-21	apt-get	09:55:13	1
1775508	99	64	54,7	cyclictest	1803002	-21	latency_hist	08:35:01	0
1775510	99	63	59,3	cyclictest	1847038	-21	kworker/u8:1+events_unbound	10:56:15	1
1775510	99	63	59,3	cyclictest	1843360	-21	kworker/u8:0+events_unbound	10:50:33	1
1775510	99	63	58,4	cyclictest	1800068	-21	kworker/u8:0+events_unbound	08:40:22	1
1775508	99	63	52,8	cyclictest	1879111	-21	latency_hist	12:30:00	0
1775510	99	62	57,4	cyclictest	1856040	-21	kworker/u8:0+events_unbound	12:05:53	1
1775510	99	62	55,5	cyclictest	1801414	-21	latency_hist	08:30:01	1
1775510	99	62	54,3	cyclictest	1773108	-21	kworker/u8:2+events_unbound	07:14:13	1
1775508	99	62	53,6	cyclictest	1866115	-21	latency_hist	11:50:01	0
1775513	99	61	58,2	cyclictest	0	-21	swapper/2	07:39:59	2
1775510	99	61	57,3	cyclictest	1847038	-21	kworker/u8:1+events_unbound	11:20:20	1
1775510	99	61	57,3	cyclictest	1800068	-21	kworker/u8:0+events_unbound	08:35:42	1
1775510	99	61	56,4	cyclictest	1793242	-21	kworker/u8:0+events_unbound	08:08:15	1
1775510	99	61	55,4	cyclictest	1869289	-21	latency_hist	12:00:00	1
1775510	99	60	56,3	cyclictest	1800068	-21	kworker/u8:0+events_unbound	09:31:14	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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This page was last modified on 2020-10-04 - 12:21