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 100 highest latencies:

System rackeslot6.osadl.org (updated Wed May 20, 2026 12:44:54)
Delayed (victim)					Switcher (culprit)			Timestamp	CPU
PID	Prio	Total latency (µs)	T^(,W^*) latency (µs)	Cmd	PID	Prio	Cmd	Timestamp	CPU
2954851	99	118	107,8	cyclictest	3061101	-21	latency_hist	12:40:02	1
2954848	99	118	106,9	cyclictest	2994801	-21	latency_hist	09:15:01	0
2954848	99	114	102,9	cyclictest	2954742	-21	kworker/u8:2+flush-179:0	07:15:01	0
2954848	99	109	102,5	cyclictest	3040435	-21	kworker/u8:3+flush-179:0	12:05:00	0
2954848	99	108	99,6	cyclictest	1213033	-21	systemd-journal	08:35:01	0
2954851	99	104	96,5	cyclictest	3041992	-21	latency_hist	11:40:01	1
2954851	99	102	93,7	cyclictest	2986848	-21	latency_hist	08:50:01	1
2954851	99	101	90,8	cyclictest	2997996	-21	latency_hist	09:25:02	1
2954851	99	101	84,11	cyclictest	1213033	-21	systemd-journal	09:40:00	1
2954851	99	100	92,5	cyclictest	3008722	-21	kworker/u8:3+flush-179:0	10:45:23	1
2954851	99	92	82,7	cyclictest	3019206	-21	apt-get	10:30:00	1
2954851	99	91	78,10	cyclictest	1213033	-21	systemd-journal	09:10:01	1
2954848	99	91	84,4	cyclictest	2961135	-21	kworker/u8:3+flush-179:0	08:05:16	0
2954848	99	91	75,13	cyclictest	3003082	-21	true	09:40:01	0
2954851	99	89	82,4	cyclictest	3047786	-21	kworker/u8:0+flush-179:0	11:55:24	1
2954848	99	85	79,4	cyclictest	3028660	-21	kworker/u8:1+flush-179:0	11:30:01	0
2954851	99	84	76,6	cyclictest	3054695	-21	kworker/u8:2+flush-179:0	12:20:01	1
2954851	99	84	76,6	cyclictest	3007091	-21	kworker/u8:0+flush-179:0	10:00:00	1
2954848	99	84	78,5	cyclictest	3001409	-21	kworker/u8:1+flush-179:0	09:40:25	0
2954851	99	83	77,4	cyclictest	2993452	-21	kworker/u8:0+flush-179:0	09:15:14	1
2954848	99	83	74,6	cyclictest	2986883	-21	kworker/u8:3+flush-179:0	08:55:22	0
2954848	99	81	71,7	cyclictest	3017646	-21	kworker/u8:2+flush-179:0	10:35:14	0
2954851	99	80	73,6	cyclictest	2982047	-21	kworker/u8:0+flush-179:0	08:50:24	1
2954851	99	78	69,7	cyclictest	3014415	-21	latency_hist	10:15:01	1
2954848	99	78	70,5	cyclictest	2962686	-21	latency_hist	07:35:01	0
2954848	99	76	67,7	cyclictest	2963229	-21	diskstats	07:35:15	0
2954851	99	75	66,7	cyclictest	3008722	-21	kworker/u8:3+flush-179:0	10:40:20	1
2954851	99	74	68,4	cyclictest	2954742	-21	kworker/u8:2+flush-179:0	07:45:26	1
2954851	99	74	66,5	cyclictest	3057915	-21	latency_hist	12:30:00	1
2954848	99	74	64,8	cyclictest	510	-21	rs:main		0
2954851	99	73	65,7	cyclictest	2957879	-21	kworker/u8:0+flush-179:0	07:20:22	1
2954851	99	72	64,5	cyclictest	3006722	-21	apt-get	09:50:12	1
2954851	99	72	62,8	cyclictest	3003552	-21	apt-get	09:40:11	1
2954848	99	71	62,6	cyclictest	3028660	-21	kworker/u8:1+flush-179:0	11:15:16	0
2954851	99	70	47,21	cyclictest	3021049	-21	apt-get	10:35:00	1
2954848	99	70	63,5	cyclictest	2969592	-21	apt-get	07:55:12	0
2954848	99	70	61,7	cyclictest	2996365	-21	kworker/u8:2+flush-179:0	09:20:00	0
2954851	99	69	61,6	cyclictest	2957879	-21	kworker/u8:0+flush-179:0	07:30:01	1
2954848	99	69	60,7	cyclictest	3044136	-21	diskstats	11:45:14	0
2954851	99	68	62,4	cyclictest	2954742	-21	kworker/u8:2+flush-179:0	07:40:22	1
2954851	99	68	62,4	cyclictest	2937332	-21	kworker/u8:3+flush-179:0	07:10:18	1
2954848	99	68	63,3	cyclictest	3040435	-21	kworker/u8:3+flush-179:0	11:40:14	0
2954848	99	67	56,9	cyclictest	2959768	-21	apt-get	07:25:12	0
2954851	99	66	59,5	cyclictest	2972565	-21	kworker/u8:1+events_unbound	08:15:19	1
2954848	99	66	59,5	cyclictest	3012876	-21	kworker/u8:1+events_unbound	10:30:00	0
2954848	99	66	47,17	cyclictest	2957928	-21	latency_hist	07:20:01	0
2954851	99	65	58,6	cyclictest	3028660	-21	kworker/u8:1+flush-179:0	11:35:01	1
2954851	99	65	57,6	cyclictest	2964360	-21	kworker/u8:0+flush-179:0	08:00:01	1
2954851	99	65	52,12	cyclictest	1213033	-21	systemd-journal	10:10:00	1
2954851	99	64	58,5	cyclictest	3007091	-21	kworker/u8:0+flush-179:0	10:00:21	1
2954851	99	64	58,4	cyclictest	2991619	-21	kworker/u8:1+flush-179:0	09:10:15	1
2954851	99	64	52,10	cyclictest	3029531	-21	apt-get	11:00:13	1
2954848	99	63	58,3	cyclictest	2964360	-21	kworker/u8:0+flush-179:0	07:50:27	0
2954848	99	63	58,3	cyclictest	2964360	-21	kworker/u8:0+flush-179:0	07:50:26	0
2954851	99	62	54,6	cyclictest	3008722	-21	kworker/u8:3+flush-179:0	11:10:14	1
2954851	99	62	54,5	cyclictest	2972565	-21	kworker/u8:1+flush-179:0	08:10:22	1
2954848	99	62	55,4	cyclictest	3056362	-21	kworker/u8:3+flush-179:0	12:35:24	0
2954851	99	61	55,5	cyclictest	3040435	-21	kworker/u8:3+flush-179:0	11:40:21	1
2954851	99	61	51,8	cyclictest	3047786	-21	kworker/u8:0+events_unbound	12:30:14	1
2954848	99	61	57,3	cyclictest	2986883	-21	kworker/u8:3+events_unbound	09:00:17	0
2954848	99	61	53,5	cyclictest	2991619	-21	kworker/u8:1+flush-179:0	09:05:15	0
2954848	99	61	51,7	cyclictest	3024494	-21	latency_hist	10:45:01	0
2954848	99	61	43,16	cyclictest	2974372	-21	apt-get	08:10:11	0
2954848	99	61	40,19	cyclictest	510	-21	rs:main		0
2954851	99	60	55,4	cyclictest	2996365	-21	kworker/u8:2+events_unbound	09:45:23	1
2954851	99	60	53,5	cyclictest	3012876	-21	kworker/u8:1+events_unbound	10:15:15	1
2954851	99	60	50,7	cyclictest	2980481	-21	latency_hist	08:30:01	1
2954848	99	60	52,6	cyclictest	2972565	-21	kworker/u8:1+flush-179:0	08:15:26	0
2954855	99	59	52,5	cyclictest	3051558	-21	turbostat	12:10:00	3
2954854	99	59	56,2	cyclictest	0	-21	swapper/2	12:27:00	2
2954851	99	59	53,5	cyclictest	3047786	-21	kworker/u8:0+flush-179:0	12:10:16	1
2954848	99	59	52,5	cyclictest	3030907	-21	kworker/u8:2+flush-179:0	11:20:26	0
2954848	99	58	51,5	cyclictest	2977569	-21	kworker/u8:2+flush-179:0	08:20:16	0
2954848	99	58	51,5	cyclictest	2977569	-21	kworker/u8:2+flush-179:0	08:20:15	0
2954855	99	57	54,2	cyclictest	0	-21	swapper/3	12:27:00	3
2954851	99	57	52,4	cyclictest	3028660	-21	kworker/u8:1+flush-179:0	11:25:00	1
2954851	99	57	52,3	cyclictest	3017646	-21	kworker/u8:2+flush-179:0	10:35:04	1
2954848	99	57	50,5	cyclictest	3008722	-21	kworker/u8:3+events_unbound	11:05:25	0
2954848	99	57	46,8	cyclictest	3025790	-21	kworker/u8:0+flush-179:0	10:55:20	0
2954851	99	56	51,4	cyclictest	2986883	-21	kworker/u8:3+flush-179:0	09:00:26	1
2954848	99	56	50,5	cyclictest	2983913	-21	kworker/u8:2+flush-179:0	08:40:16	0
2954848	99	56	48,7	cyclictest	3039475	-21	kworker/u8:0+flush-179:0	11:30:21	0
2954851	99	55	49,5	cyclictest	2972565	-21	kworker/u8:1+events_unbound	08:30:24	1
2954848	99	55	47,6	cyclictest	2959512	-21	latency_hist	07:25:00	0
2954851	99	54	48,4	cyclictest	2983913	-21	kworker/u8:2+flush-179:0	08:40:20	1
2954851	99	54	47,5	cyclictest	2977569	-21	kworker/u8:2+events_unbound	08:20:24	1
2954851	99	54	47,5	cyclictest	2977569	-21	kworker/u8:2+events_unbound	08:20:24	1
2954851	99	54	46,6	cyclictest	2954742	-21	kworker/u8:2+flush-179:0	07:15:22	1
2954848	99	54	48,4	cyclictest	2982047	-21	kworker/u8:0+flush-179:0	08:45:20	0
2954848	99	54	45,7	cyclictest	3008722	-21	kworker/u8:3+flush-179:0	10:05:20	0
2954851	99	53	44,7	cyclictest	3054999	-21	apt-get	12:20:10	1
2954848	99	53	49,3	cyclictest	2982047	-21	kworker/u8:0+flush-179:0	08:50:23	0
2954848	99	53	48,4	cyclictest	3051782	-21	kworker/u8:1+events_unbound	12:15:23	0
2954848	99	53	48,4	cyclictest	2996365	-21	kworker/u8:2+flush-179:0	09:45:22	0
2954848	99	53	46,5	cyclictest	3047786	-21	kworker/u8:0+flush-179:0	12:30:19	0
2954851	99	52	42,8	cyclictest	2986883	-21	kworker/u8:3+flush-179:0	08:55:26	1
2954848	99	52	44,6	cyclictest	3028660	-21	kworker/u8:1+flush-179:0	11:00:23	0
2954851	99	51	46,4	cyclictest	3028660	-21	kworker/u8:1+events_unbound	11:15:20	1
2954851	99	51	46,4	cyclictest	2996365	-21	kworker/u8:2+flush-179:0	09:25:19	1
2954851	99	51	46,4	cyclictest	2996365	-21	kworker/u8:2+flush-179:0	09:25:19	1
^Timer ^*Wakeup (latency=timer+wakeup+contextswitch)


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