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2026-08-19 - 14:13

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #4

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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  Intel
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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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack5slot4s.osadl.org (updated Wed Aug 19, 2026 12:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
248599621740,3sleep3451irq_work/309:42:483
233163699171152,17cyclictest0-21swapper/011:20:010
233164199165159,4cyclictest2581890-21munin-run11:20:011
2331643997571,2cyclictest2581949-21gpgv11:20:012
26451042670,3sleep0201rcuc/012:22:490
2331643995544,8cyclictest275-21systemd-journal10:30:002
25064582520,2chrt0-21swapper/110:02:491
2331641995140,8cyclictest2336524-21latency_hist07:15:001
2331636995141,7cyclictest2452927-21latency_hist09:10:010
2331636995042,5cyclictest2363467-21latency_hist07:40:010
2331636995039,8cyclictest2443061-21latency_hist09:00:010
2331636994941,6cyclictest2571953-21latency_hist11:10:010
2331636994938,9cyclictest2587030-21dpkg11:23:180
2331641994841,5cyclictest2368909-21kworker/u8:0+flush-8:009:22:551
2331636994642,3cyclictest2656385-21kworker/u8:2+events_unbound12:37:400
2331641994536,7cyclictest2437362-21ntpq08:52:501
2331641994536,6cyclictest2592185-21latency_hist11:30:011
2331641994437,5cyclictest2527424-21latency_hist10:25:001
2331641994231,9cyclictest2616907-21awk11:55:001
2331643994026,12cyclictest2657016-21aten2_r5power_c12:37:392
2331643994026,12cyclictest2612448-21aten2_r5power_e11:52:372
2331643994021,17cyclictest2336523-21apt-get07:15:002
2331641994035,4cyclictest2190372-21kworker/u8:3+flush-8:007:27:421
2331636994030,7cyclictest2651598-21latency_hist12:30:010
2331641993934,4cyclictest2368909-21kworker/u8:0+flush-8:007:47:551
2331641993932,5cyclictest275-21systemd-journal08:32:041
2331641993831,5cyclictest2601357-21ntpq11:37:511
2331641993830,6cyclictest2621082-21ntpq11:57:481
2331641993827,9cyclictest2387976-21ntpq08:02:511
2331641993825,10cyclictest275-21systemd-journal10:20:001
2331643993727,8cyclictest275-21systemd-journal08:25:002
2331643993727,8cyclictest275-21systemd-journal08:25:002
2331641993731,4cyclictest2413692-21kworker/u8:2+flush-8:009:42:561
2331641993731,4cyclictest2326131-21kworker/u8:4+events_unbound07:15:021
2331641993729,5cyclictest275-21systemd-journal09:04:031
2331641993729,5cyclictest2562067-21latency_hist11:00:011
2331636993732,4cyclictest2562326-21kworker/u8:2+flush-8:011:40:010
2331643993621,13cyclictest2507375-21unixbench_multi10:02:582
2331643993621,13cyclictest2483486-21fschecks_time09:42:422
2331641993629,5cyclictest2408874-21apt-get08:27:371
2331636993630,4cyclictest2368909-21kworker/u8:0+flush-8:008:12:420
2331643993521,13cyclictest0-21swapper/207:40:002
2331643993515,2cyclictest0-21swapper/208:52:392
2331641993529,4cyclictest2428231-21latency_hist08:45:011
2331641993529,4cyclictest2383528-21grep07:57:571
2331641993525,8cyclictest2402760-21ntpq08:17:491
2331636993530,4cyclictest2458205-21kworker/u8:1+flush-8:009:57:400
2331643993427,5cyclictest2502445-21apt-get10:00:002
2331641993427,5cyclictest2540476-21kworker/u8:2+flush-8:010:42:521
2331641993427,5cyclictest2498208-21diskstats09:57:391
2331641993427,5cyclictest2458205-21kworker/u8:1+flush-8:009:52:471
2331636993429,4cyclictest2368909-21kworker/u8:0+flush-8:008:42:420
2331636993427,5cyclictest2551968-21grep10:47:570
2331636993425,7cyclictest2412728-21ntpq08:27:530
2331636993423,8cyclictest2538016-21diskstats10:37:410
2331643993314,3cyclictest0-21swapper/210:32:562
2331643993314,3cyclictest0-21swapper/210:32:562
2331641993329,3cyclictest2537337-21systemd-run10:35:001
2331641993329,3cyclictest2537337-21systemd-run10:35:001
2331641993328,3cyclictest2557123-21kworker/u8:0+flush-8:012:00:061
2331641993325,6cyclictest2567493-21apt-get11:07:381
23314202334,8sleep10-21swapper/107:09:541
233164399327,9cyclictest2349075-21apt-get07:27:382
233164399323,7cyclictest2522916-21apt-get10:22:402
2331643993218,12cyclictest2443749-21cpuspeed_turbos09:02:402
2331643993214,2cyclictest0-21swapper/207:15:052
233164399320,9cyclictest2480065-21grep09:37:472
2331641993226,5cyclictest2358487-21kworker/u8:2+events_unbound08:22:411
2331641993226,5cyclictest2358487-21kworker/u8:2+events_unbound08:22:411
2331641993226,4cyclictest2586991-21apt-get11:23:201
2331641993226,4cyclictest2398359-21unixbench_singl08:12:581
2331641993225,5cyclictest2453384-21apt-get09:12:381
2331641993223,7cyclictest2641028-21ntpq12:17:511
2331636993228,3cyclictest2477722-21cron09:35:000
2331636993228,3cyclictest2458205-21kworker/u8:1+flush-8:009:17:420
2331636993227,4cyclictest2458205-21kworker/u8:1+flush-8:010:59:350
2331636993226,4cyclictest275-21systemd-journal12:31:200
2331636993225,6cyclictest2404022-21aten2_r5power_e08:22:400
2331636993225,6cyclictest2404022-21aten2_r5power_e08:22:400
2331636993224,6cyclictest2640936-21needreboot12:17:490
2331636993224,6cyclictest2419057-21grep08:37:410
2331636993221,9cyclictest2632470-21diskstats12:12:410
233164399313,7cyclictest2587654-21apt-get11:27:372
2331643993116,13cyclictest0-21swapper/211:32:502
2331643993113,3cyclictest0-21swapper/209:15:002
2331641993128,2cyclictest2596904-21unixbench_multi11:32:581
2331641993125,4cyclictest2632595-21kworker/u8:4-ext4-rsv-conversion12:25:001
2331641993125,4cyclictest2368909-21kworker/u8:0+flush-8:009:32:551
2331641993118,5cyclictest275-21systemd-journal10:38:041
2331636993126,4cyclictest2368909-21kworker/u8:0+flush-8:007:57:410
2331636993125,5cyclictest2463438-21aten2_r5power_v09:22:400
2331636993124,6cyclictest2418121-21unixbench_singl08:32:590
2331636993123,6cyclictest2602611-21aten2_r5power_p11:42:400
2331636993123,6cyclictest2336508-21cron07:15:000
233163699310,29cyclictest2378597-21true07:55:000
26156582300,4sleep30-21swapper/311:52:463
2331643993017,11cyclictest0-21swapper/211:50:002
2331643993017,11cyclictest0-21swapper/208:20:002
2331643993014,2cyclictest0-21swapper/209:27:472
2331641993026,3cyclictest2413692-21kworker/u8:2+flush-8:009:37:551
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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