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2026-01-05 - 07:36

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, 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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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 rack3slot3s.osadl.org (updated Mon Jan 05, 2026 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2209304211458,51sleep30-21swapper/319:06:063
220943528555,9sleep20-21swapper/219:07:452
220957228254,20sleep00-21swapper/019:09:310
220876827456,10sleep10-21swapper/119:05:231
2209720992320,1cyclictest0-21swapper/320:39:413
2209720992320,1cyclictest0-21swapper/319:10:273
2209720992319,1cyclictest0-21swapper/322:50:003
220972099231,18cyclictest2269610-21taskset20:05:013
221530822211,7sleep12215108-21munin-node19:15:011
2209720992219,1cyclictest0-21swapper/300:09:593
2209720992118,1cyclictest0-21swapper/322:40:263
2209720992017,1cyclictest0-21swapper/320:44:593
2209720992017,1cyclictest0-21swapper/320:25:123
2209720992016,2cyclictest0-21swapper/323:30:103
2209720992016,2cyclictest0-21swapper/322:20:123
220972099199,7cyclictest2338366-21taskset21:10:133
220972099195,7cyclictest2495204-21taskset23:35:483
2209720991917,1cyclictest0-21swapper/319:30:173
2209720991916,1cyclictest0-21swapper/323:40:243
2209720991916,1cyclictest0-21swapper/323:10:213
2209720991916,1cyclictest0-21swapper/322:10:183
2209720991916,1cyclictest0-21swapper/320:45:153
2209720991916,1cyclictest0-21swapper/319:15:153
2209720991915,2cyclictest0-21swapper/322:35:143
2209720991915,2cyclictest0-21swapper/321:55:293
220972099191,14cyclictest0-21swapper/320:50:123
220972099191,13cyclictest2537914-21chrt00:20:133
220972099191,13cyclictest2369211-21turbostat21:40:013
220972099186,9cyclictest2390171-21turbostat22:04:553
2209720991815,1cyclictest0-21swapper/323:15:123
2209720991815,1cyclictest0-21swapper/320:00:273
2209720991815,1cyclictest0-21swapper/300:25:183
2209720991814,2cyclictest0-21swapper/321:20:013
2209720991814,2cyclictest0-21swapper/320:20:013
220972099181,13cyclictest0-21swapper/320:55:263
220972099181,13cyclictest0-21swapper/300:35:143
220972099181,10cyclictest2451784-21taskset22:55:163
23420142171,10sleep22342061-21/usr/sbin/munin21:10:222
2209720991714,1cyclictest0-21swapper/319:45:113
2209720991713,2cyclictest0-21swapper/323:25:003
2209720991713,2cyclictest0-21swapper/320:10:183
220972099171,10cyclictest2396011-21taskset22:05:133
220972099170,14cyclictest0-21swapper/321:40:133
24638142161,11sleep02463925-21sed23:10:010
24329402161,9sleep22433149-21hddtemp_smartct22:40:172
24174172161,10sleep12417486-21irqstats22:25:171
22497882163,8sleep02251484-21cut19:45:150
220972099161,9cyclictest2453606-21taskset23:00:123
220972099161,9cyclictest2243393-21chrt19:40:123
2209720991613,1cyclictest0-21swapper/322:25:133
2209720991612,2cyclictest0-21swapper/300:33:243
2209720991611,3cyclictest0-21swapper/323:45:123
220972099161,13cyclictest0-21swapper/322:35:013
220972099161,13cyclictest0-21swapper/321:05:203
220972099161,13cyclictest0-21swapper/319:25:013
220972099161,12cyclictest0-21swapper/321:00:153
220972099161,12cyclictest0-21swapper/321:00:153
220972099161,12cyclictest0-21swapper/319:55:223
220972099161,11cyclictest2443089-21chrt22:50:113
220972099161,10cyclictest2295468-21sleep20:34:553
220972099160,13cyclictest0-21swapper/322:15:233
220972099160,12cyclictest0-21swapper/319:35:203
25501132151,9sleep22551886-21tr00:30:192
22640832151,4sleep22264116-21munin-run20:00:002
220972099151,9cyclictest2533113-21taskset00:15:153
220972099151,9cyclictest2527362-21taskset00:10:113
220972099151,9cyclictest2516363-21taskset23:59:133
220972099151,9cyclictest2463590-21taskset23:07:103
220972099151,9cyclictest2253900-21taskset19:50:063
220972099151,9cyclictest2232538-21taskset19:28:093
2209720991512,1cyclictest0-21swapper/321:50:223
2209720991512,1cyclictest0-21swapper/321:30:183
2209720991512,1cyclictest0-21swapper/321:25:173
2209720991512,1cyclictest0-21swapper/320:20:143
2209720991512,1cyclictest0-21swapper/300:00:193
220972099151,11cyclictest2353452-21sleep21:25:003
220972099150,12cyclictest0-21swapper/323:50:183
25027152140,3sleep20-21swapper/223:45:172
24378802140,2sleep10-21swapper/122:45:131
24155612141,8sleep12415650-21ntpq22:20:201
220972099141,9cyclictest2480035-21taskset23:25:023
220972099140,11cyclictest0-21swapper/321:45:123
25157352131,8sleep12515786-21sed23:55:261
25069422131,7sleep02508563-21kthreadcore23:50:170
24260972131,3sleep02426133-21/usr/sbin/munin22:30:200
24069382131,8sleep22407557-21cut22:15:152
23659112131,7sleep12367668-21kthreadcore21:35:181
23158002131,8sleep22315914-21/usr/sbin/munin20:45:212
22644412131,8sleep02264655-21df_inode20:00:130
22635452131,7sleep02263714-21users19:55:290
25489322121,6sleep12548965-21kthreadcore00:30:171
25481002121,5sleep02548148-21munin-run00:30:010
25207652121,7sleep02520811-21ntp_kernel_pll_00:00:230
25065212121,6sleep12506543-21fschecks_count23:50:141
24972992121,7sleep02497856-21kthreadcore23:40:190
24593792121,6sleep22459422-21kthreadcore23:05:182
24488702121,6sleep12450018-21kthreadcore22:55:151
23796672121,7sleep02379879-21latency_hist21:50:000
23647732125,3sleep02365909-21cut21:35:170
23366962121,6sleep22336745-21ntpq21:05:262
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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