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2026-09-17 - 12:19

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #2

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 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 rack1slot2s.osadl.org (updated Thu Sep 17, 2026 00:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
304450970,0irq/25-eth10-21swapper/318:43:213
1096625453,0sleep00-21swapper/018:38:580
1637223523,0sleep20-21swapper/218:42:242
1624623324,0sleep10-21swapper/118:40:551
339960,0migration/332284-21irqcore21:13:593
339960,0migration/330515-21sh20:52:543
339960,0migration/324871-21kthreadcore21:08:583
339960,0migration/322269-21sh21:28:123
339960,0migration/320299-21sh22:26:563
339960,0migration/319922-21munin-node21:44:023
339960,0migration/319173-21sh22:44:583
29715060,0irq/26-eth0-rx-8146-21sed20:38:423
29715060,0irq/26-eth0-rx-29380-21kthreadcore19:13:583
19160,0ktimersoftd/10-21swapper/123:41:261
165599966,0cyclictest0-21swapper/222:23:252
165599960,0cyclictest0-21swapper/223:29:012
8215050,0irq/24-0000:00:24161-21perf19:13:422
4150,0ktimersoftd/00-21swapper/023:43:530
339950,0migration/39951-21sendmail_mailtr22:59:023
339950,0migration/37927-21kthreadcore21:58:583
339950,0migration/35744-21kthreadcore23:18:583
339950,0migration/35681-21kernelversion18:58:563
339950,0migration/332228-21aten_r1power_vo19:43:533
339950,0migration/332213-21kthreadcore22:13:563
339950,0migration/331493-21munin-node20:53:533
339950,0migration/328257-21kthreadcore20:03:583
339950,0migration/320682-21kthreadcore19:33:583
339950,0migration/32011-21runrttasks23:14:383
339950,0migration/319836-21munin-node20:19:053
339950,0migration/319461-21taskset19:58:233
339950,0migration/317099-21kthreadcore20:43:593
339950,0migration/316660-21processes19:04:023
339950,0migration/314266-21kthreadcore23:43:573
339950,0migration/313963-21sh21:22:043
339950,0migration/313364-21kernelversion19:28:573
339950,0migration/312492-21taskset19:50:033
339950,0migration/310616-21latency22:18:593
29725050,0irq/27-eth0-tx-6377-21munin-node19:49:050
29725050,0irq/27-eth0-tx-4402-21munin-node18:58:570
29725050,0irq/27-eth0-tx-3974-21ssh21:54:172
29725050,0irq/27-eth0-tx-31638-21grep22:33:572
29725050,0irq/27-eth0-tx-31113-21munin-node20:53:592
29725050,0irq/27-eth0-tx-30275-21kthreadcore22:53:562
29725050,0irq/27-eth0-tx-24918-21vmstat00:09:042
29725050,0irq/27-eth0-tx-21251-21ssh20:44:330
29725050,0irq/27-eth0-tx-173792chrt23:44:032
29725050,0irq/27-eth0-tx-16767-21munin-node18:44:050
29725050,0irq/27-eth0-tx-14578-21ssh21:03:062
29725050,0irq/27-eth0-tx-10459-21ssh23:42:152
29725050,0irq/27-eth0-tx-0-21swapper/222:42:512
29725050,0irq/27-eth0-tx-0-21swapper/222:30:112
29725050,0irq/27-eth0-tx-0-21swapper/222:03:422
29725050,0irq/27-eth0-tx-0-21swapper/221:23:262
29715050,0irq/26-eth0-rx-6998-21cut23:39:023
29715050,0irq/26-eth0-rx-6690-21df_abs21:38:533
29715050,0irq/26-eth0-rx-4730-21cut20:08:583
29715050,0irq/26-eth0-rx-31447-21idleruntime21:33:543
29715050,0irq/26-eth0-rx-22452-21hwlatdetect22:08:553
29715050,0irq/26-eth0-rx-16101-21if_eth1.221:03:563
29715050,0irq/26-eth0-rx-0-21swapper/323:57:243
29715050,0irq/26-eth0-rx-0-21swapper/323:34:013
29715050,0irq/26-eth0-rx-0-21swapper/323:25:293
29715050,0irq/26-eth0-rx-0-21swapper/323:07:423
29715050,0irq/26-eth0-rx-0-21swapper/322:38:443
29715050,0irq/26-eth0-rx-0-21swapper/322:30:033
29715050,0irq/26-eth0-rx-0-21swapper/321:57:263
29715050,0irq/26-eth0-rx-0-21swapper/321:31:263
27150,0ktimersoftd/20-21swapper/222:44:242
259950,0migration/24666-21sh22:17:532
259950,0migration/22901-21aten2.4-expect23:58:522
259950,0migration/211556-21latency_hist23:23:402
259950,0migration/210171-21timerandwakeup18:59:022
179950,0migration/15203-21taskset21:36:171
179950,0migration/132009-21kthreadcore22:33:571
179950,0migration/128119-21missed_timers21:28:591
179950,0migration/127137-21munin-node20:03:551
179950,0migration/125547-21taskset23:09:001
179950,0migration/124208-21missed_timers00:08:591
179950,0migration/117903-21munin-node23:04:011
179950,0migration/114323-21aten_r1power_po21:43:531
179950,0migration/111621-21taskset19:26:111
179950,0migration/110262-21timerwakeupswit18:59:021
165599955,0cyclictest0-21swapper/223:38:192
165599950,0cyclictest0-21swapper/223:53:362
165599950,0cyclictest0-21swapper/223:15:272
165599950,0cyclictest0-21swapper/221:49:032
165599950,0cyclictest0-21swapper/219:13:552
165589955,0cyclictest0-21swapper/122:06:411
165589955,0cyclictest0-21swapper/121:03:091
165589950,0cyclictest0-21swapper/123:55:191
165589950,0cyclictest0-21swapper/122:01:571
165589950,0cyclictest0-21swapper/121:57:141
165589950,0cyclictest0-21swapper/119:33:451
165579955,0cyclictest0-21swapper/023:58:230
165579954,0cyclictest3556-21lldpd21:05:470
165579954,0cyclictest22206-21sed22:28:590
165579954,0cyclictest21472-21sh21:25:460
165579950,0cyclictest0-21swapper/023:17:040
165579950,0cyclictest0-21swapper/021:43:350
165579950,0cyclictest0-21swapper/021:32:420
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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