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2025-04-03 - 16:14

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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 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 rack5slot3s.osadl.org (updated Thu Apr 03, 2025 12:44:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
258092235161,23sleep10-21swapper/107:07:491
259312205167,25sleep20-21swapper/207:09:242
256722203165,25sleep30-21swapper/307:06:033
256642202163,26sleep00-21swapper/007:05:540
170052600,3sleep011-21rcuc/009:20:180
298952580,4sleep12607999cyclictest11:30:151
154002560,2sleep20-21swapper/207:55:232
2608599402,27cyclictest16564-21/usr/sbin/munin08:00:132
2608599394,30cyclictest1556-40dnf11:38:402
2608599394,24cyclictest780-21rngd09:00:132
2608599385,28cyclictest32128-40dnf08:37:342
2608599381,27cyclictest21202-21/usr/sbin/munin09:35:212
2608599381,25cyclictest5582-21/usr/sbin/munin07:35:192
2608599381,25cyclictest13297-21gltestperf10:40:162
2608599371,26cyclictest25358-21/usr/sbin/munin08:20:262
2608599371,25cyclictest1042-21/usr/sbin/munin10:10:222
2608599371,22cyclictest8975-21idleruntime10:30:182
2608599363,21cyclictest19425-21chrt10:57:282
2608599361,20cyclictest6768-21latency_hist11:55:022
2608599361,20cyclictest4563-21switchtime10:15:262
2608599354,15cyclictest12050irq/123-ahci[0008:15:022
2608599351,22cyclictest1167-21/usr/sbin/munin07:25:202
2609199344,11cyclictest17464-21/usr/sbin/munin09:20:263
2608599341,24cyclictest24626-21gunzip09:40:242
2608599341,23cyclictest0-21swapper/212:10:222
2608599341,22cyclictest836-21runrttasks10:35:422
2608599341,22cyclictest32010-21timerwakeupswit10:00:262
2608599341,22cyclictest27282-21ntp_states09:50:192
2608599341,20cyclictest12562-21/usr/sbin/munin12:15:282
2608599341,16cyclictest12853-21grep09:10:212
2607499346,13cyclictest27953-21awk08:30:000
2608599335,18cyclictest0-21swapper/212:33:372
2608599333,23cyclictest86850irq/129-enp1s0-09:20:252
2608599332,21cyclictest7781-21/usr/sbin/munin07:40:212
2608599331,28cyclictest21677-40dnf12:39:322
2608599331,18cyclictest26443-21sed11:15:262
2608599321,4cyclictest22625-21latency_hist11:10:022
2608599321,18cyclictest25994-21perf09:50:012
2608599321,18cyclictest25994-21perf09:50:012
2608599321,18cyclictest11578-21diskmemload11:27:252
2608599321,16cyclictest0-21swapper/210:10:022
2608599319,19cyclictest937-21latency_hist07:25:002
2608599319,19cyclictest3445-21cpu07:30:182
2608599315,23cyclictest19010-21/usr/sbin/munin09:30:292
2608599315,15cyclictest6899-21sshd08:56:372
2608599313,17cyclictest11578-21diskmemload11:43:412
2608599311,27cyclictest31481-21/usr/sbin/munin11:30:292
2608599311,27cyclictest23770-21head08:15:162
2608599311,26cyclictest11235-21smart_sda07:45:252
2608599311,20cyclictest9523-21/usr/sbin/munin12:05:022
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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