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2026-05-09 - 08:15

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 Sat May 09, 2026 00:44:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2125557996810,20cyclictest2155924-21/usr/sbin/munin22:05:181
212556199673,43cyclictest0-21swapper/221:20:012
2125555996351,7cyclictest0-21swapper/020:25:010
2125555996142,16cyclictest15-21rcuc/000:05:140
212556199608,28cyclictest30-21rcuc/220:30:192
212555599606,18cyclictest12-21ksoftirqd/021:10:010
2125555995439,6cyclictest167350irq/118-8000000.ethernet-tx019:55:010
2125555995322,28cyclictest15-21rcuc/000:10:250
2125555995235,13cyclictest131ktimers/023:55:110
2125555995235,13cyclictest131ktimers/023:55:110
212555599511,48cyclictest0-21swapper/021:05:000
212555599511,48cyclictest0-21swapper/021:05:000
212555599508,12cyclictest2147183-21apt-get21:15:010
212555599508,12cyclictest2147183-21apt-get21:15:010
2125561994936,6cyclictest2126347-21kworker/u8:0-ext4-rsv-conversion19:25:012
2125557994942,5cyclictest0-21swapper/121:25:011
2125557994942,5cyclictest0-21swapper/121:25:011
212555599491,4cyclictest0-21swapper/022:55:010
212555599491,4cyclictest0-21swapper/022:55:010
2125561994835,8cyclictest0-21swapper/219:55:012
2125561994831,11cyclictest311ktimers/220:40:142
2125555994839,5cyclictest2127430-21grep19:15:280
212556199476,37cyclictest32-21ksoftirqd/220:15:012
2125561994737,7cyclictest311ktimers/200:10:262
2125561994737,5cyclictest0-21swapper/221:05:272
2125561994736,7cyclictest2127433-21unixbench_singl19:15:282
2125561994736,7cyclictest0-21swapper/200:15:302
2125561994736,7cyclictest0-21swapper/200:15:292
2125561994736,6cyclictest0-21swapper/223:40:012
2125557994730,11cyclictest231ktimers/120:05:141
2125555994740,4cyclictest167350irq/118-8000000.ethernet-tx020:15:160
2125555994731,12cyclictest0-21swapper/020:30:280
2125561994631,9cyclictest0-21swapper/200:30:292
2125561994631,8cyclictest14-21rcu_preempt22:30:272
2125561994630,12cyclictest0-21swapper/200:25:272
2125557994627,11cyclictest0-21swapper/122:35:281
2125557994627,11cyclictest0-21swapper/122:35:281
2125555994638,4cyclictest167350irq/118-8000000.ethernet-tx023:50:210
212555599462,7cyclictest2157799-21dropbear22:15:200
2125561994537,5cyclictest2163329-21munin-plugin-st22:50:002
2125557994515,11cyclictest2177775-21apt-get00:15:011
2125555994538,4cyclictest20650irq/252-8000000.ethernet23:25:240
2125555994534,8cyclictest0-21swapper/022:40:260
2125561994434,5cyclictest0-21swapper/219:10:272
2125557994430,9cyclictest231ktimers/123:20:111
2125557994427,9cyclictest0-21swapper/100:00:001
2125557994427,9cyclictest0-21swapper/100:00:001
2125555994437,4cyclictest20650irq/252-8000000.ethernet22:45:150
2125555994436,5cyclictest167350irq/118-8000000.ethernet-tx019:20:150
2125555994435,5cyclictest2164919-21grep22:55:270
212555599442,5cyclictest2166370-21memory23:05:250
2125561994331,7cyclictest0-21swapper/221:05:002
2125561994331,7cyclictest0-21swapper/221:05:002
2125561994325,10cyclictest0-21swapper/221:45:282
2125557994331,9cyclictest231ktimers/121:55:111
212555599435,13cyclictest15-21rcuc/022:10:000
212555599434,12cyclictest12-21ksoftirqd/022:35:010
2125555994337,3cyclictest167350irq/118-8000000.ethernet-tx019:30:200
2125555994336,4cyclictest167350irq/118-8000000.ethernet-tx023:40:240
2125555994335,5cyclictest0-21swapper/021:20:260
2125555994335,5cyclictest0-21swapper/021:20:260
2125555994333,5cyclictest0-21swapper/023:20:270
2125555994332,7cyclictest0-21swapper/023:45:280
2125555994331,8cyclictest0-21swapper/022:35:280
2125555994331,8cyclictest0-21swapper/022:35:280
212555599431,39cyclictest2154876-21tr22:00:000
212555599431,36cyclictest0-21swapper/000:15:040
212555599431,36cyclictest0-21swapper/000:15:040
2125561994233,5cyclictest2138603-21grep20:20:292
2125561994232,7cyclictest0-21swapper/223:15:002
2125561994228,9cyclictest0-21swapper/223:05:282
2125561994227,10cyclictest0-21swapper/219:30:272
212555799425,23cyclictest22-21rcuc/120:00:011
2125557994232,5cyclictest0-21swapper/119:15:201
2125557994230,6cyclictest0-21swapper/121:35:271
2125555994234,6cyclictest15-21rcuc/022:10:240
2125555994231,8cyclictest0-21swapper/020:55:280
2125555994231,7cyclictest0-21swapper/000:35:290
2125555994231,5cyclictest0-21swapper/023:30:270
212555599422,5cyclictest2155247-21lsblk22:00:200
212555599422,5cyclictest2155247-21lsblk22:00:200
212555599421,38cyclictest2151899-21grep21:40:200
212555599421,38cyclictest0-21swapper/019:45:280
2125557994129,8cyclictest2171868-21sendmail23:40:001
2125557994128,8cyclictest0-21swapper/100:30:021
2125557994128,11cyclictest231ktimers/122:45:111
212555599416,32cyclictest12-21ksoftirqd/020:05:200
2125555994127,10cyclictest0-21swapper/019:45:010
2125555994127,10cyclictest0-21swapper/019:45:010
212555599411,38cyclictest0-21swapper/020:50:200
212555599411,29cyclictest2126502-21latency_hist19:15:010
2125561994033,5cyclictest311ktimers/222:50:242
2125561994033,5cyclictest311ktimers/222:50:232
2125561994033,4cyclictest2165012-21munin-plugin-st23:00:002
2125561994031,5cyclictest0-21swapper/221:25:272
2125561994029,7cyclictest311ktimers/221:00:002
2125561994027,9cyclictest311ktimers/223:45:112
2125557994026,9cyclictest0-21swapper/122:10:271
2125557994026,8cyclictest0-21swapper/100:40:001
2125557994025,8cyclictest0-21swapper/121:30:281
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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