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2026-06-19 - 10:04

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #6

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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rackeslot6s.osadl.org (updated Fri Jun 19, 2026 00:44:49)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
578238997116,17cyclictest633273-21/usr/sbin/munin00:30:181
578238995542,8cyclictest583639-21sendmail19:40:001
578238995542,8cyclictest583639-21sendmail19:40:001
578241995446,4cyclictest608320-21munin-plugin-st22:05:002
578238995443,7cyclictest0-21swapper/120:00:001
578238995243,5cyclictest598937-21munin-plugin-st21:10:001
578241995042,4cyclictest623687-21munin-plugin-st23:35:002
578236995035,10cyclictest0-21swapper/000:35:010
578241994938,6cyclictest578465-21sshd19:10:172
578238994835,9cyclictest604002-21sendmail21:40:001
578238994832,9cyclictest589549-21munin-plugin-st20:15:001
578241994733,8cyclictest593547-21phc2sys20:35:262
578236994739,5cyclictest580115-21grep19:15:290
578236994736,7cyclictest20850irq/208-8000000.ethernet21:20:290
578236994735,8cyclictest0-21swapper/022:40:000
578238994639,3cyclictest586175-21cut19:55:001
578238994636,6cyclictest585335-21munin-plugin-st19:50:001
578238994632,8cyclictest598042-21unixbench_singl21:00:291
578238994631,9cyclictest0-21swapper/121:20:291
578236994634,8cyclictest0-21swapper/022:10:000
578236994622,7cyclictest15-21rcuc/000:40:010
578241994535,6cyclictest632175-21grep00:20:312
578238994533,7cyclictest604854-21munin-plugin-st21:45:001
578238994529,11cyclictest0-21swapper/100:35:291
578236994537,4cyclictest0-21swapper/019:10:280
578236994535,6cyclictest0-21swapper/023:45:290
578241994436,5cyclictest610932-21sendmail22:20:002
578241994434,7cyclictest0-21swapper/222:00:002
578241994434,7cyclictest0-21swapper/222:00:002
578241994426,12cyclictest0-21swapper/221:00:292
578238994434,7cyclictest580173-21apt-get19:20:001
578238994433,7cyclictest0-21swapper/119:20:271
578238994416,19cyclictest22-21rcuc/122:15:021
578236994432,9cyclictest596328-21grep20:50:300
578241994335,4cyclictest585334-21munin-plugin-st19:50:002
578241994332,7cyclictest0-21swapper/221:20:292
578241994314,23cyclictest0-21swapper/221:29:242
578238994320,13cyclictest591450-21/usr/sbin/munin20:25:181
578236994335,4cyclictest590405-21sendmail20:20:000
578241994232,5cyclictest0-21swapper/200:15:312
578238994230,8cyclictest0-21swapper/123:20:291
578238994230,7cyclictest0-21swapper/120:05:291
578238994229,8cyclictest0-21swapper/119:15:011
578238994226,9cyclictest0-21swapper/122:05:281
578236994232,6cyclictest0-21swapper/020:20:270
578241994132,4cyclictest0-21swapper/219:20:252
578241994131,4cyclictest580187-21sendmail19:20:002
578241994130,7cyclictest0-21swapper/220:25:282
578241994129,7cyclictest0-21swapper/223:10:282
578238994133,5cyclictest627152-21munin-plugin-st23:55:011
578238994129,8cyclictest0-21swapper/122:35:301
578238994128,8cyclictest0-21swapper/122:30:291
578238994125,9cyclictest0-21swapper/122:40:281
578238994122,10cyclictest0-21swapper/123:45:301
578238994121,9cyclictest626304-21kworker/u8:1+events_freezable_power_00:15:191
57823899411,34cyclictest0-21swapper/123:40:261
57823899411,2cyclictest0-21swapper/119:30:011
578236994134,4cyclictest167350irq/118-8000000.ethernet-tx000:25:180
578236994128,9cyclictest0-21swapper/019:35:270
578236994128,9cyclictest0-21swapper/019:35:270
578236994126,9cyclictest594001-21latency_hist20:40:010
578241994030,5cyclictest628742-21grep00:00:332
578241994028,8cyclictest0-21swapper/223:50:292
578241994025,10cyclictest0-21swapper/222:45:272
578241994025,10cyclictest0-21swapper/222:45:272
57824199401,2cyclictest0-21swapper/222:20:022
57824199401,2cyclictest0-21swapper/222:20:012
578238994026,9cyclictest0-21swapper/121:45:291
578238994026,9cyclictest0-21swapper/121:45:291
578238994026,9cyclictest0-21swapper/100:10:291
578238994026,8cyclictest0-21swapper/100:25:301
578236994034,4cyclictest0-21swapper/022:20:120
578236994034,4cyclictest0-21swapper/022:20:120
578236994033,4cyclictest167350irq/118-8000000.ethernet-tx022:00:240
578236994032,4cyclictest0-21swapper/020:10:000
578236994029,8cyclictest600621-21sendmail21:20:000
57823699401,3cyclictest0-21swapper/021:25:120
578241993926,8cyclictest0-21swapper/200:30:192
578238993929,6cyclictest593760-21unixbench_multi20:35:291
578238993929,5cyclictest0-21swapper/122:50:291
578238993927,9cyclictest0-21swapper/123:55:301
578238993925,9cyclictest0-21swapper/123:30:281
578238993925,9cyclictest0-21swapper/120:20:271
578238993925,9cyclictest0-21swapper/119:40:281
578238993921,9cyclictest0-21swapper/100:20:301
57823699398,28cyclictest619429-21unixbench_singl23:05:300
57823699394,31cyclictest0-21swapper/023:25:190
578236993931,5cyclictest0-21swapper/020:45:300
578236993928,7cyclictest0-21swapper/000:00:340
57823699391,3cyclictest580589-21fschecks_count19:20:180
578241993830,5cyclictest0-21swapper/221:40:282
578241993829,6cyclictest625323-21grep23:40:322
578241993829,5cyclictest0-21swapper/223:55:272
578241993826,8cyclictest0-21swapper/221:15:312
578238993827,7cyclictest0-21swapper/122:00:011
578238993827,7cyclictest0-21swapper/122:00:011
578238993826,8cyclictest0-21swapper/123:10:291
578238993826,7cyclictest0-21swapper/121:10:291
578238993825,8cyclictest0-21swapper/100:05:291
578238993825,8cyclictest0-21swapper/100:05:291
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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