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2026-09-11 - 09:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #f, slot #4

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 highest latencies:
System rackfslot4s.osadl.org (updated Fri Sep 11, 2026 00:44:37)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1277621200,4chrt12770-21smartctl00:11:450
1540021190,2chrt15404-21runrttasks21:49:590
2836121160,2chrt28359-21munin-plugin-st20:30:000
576621140,2sleep05769-21seq20:45:330
2775221140,3chrt27753-21sh00:33:290
1490521140,3chrt14906-21chrt22:37:180
207421130,2chrt2075-21/usr/sbin/munin19:46:260
1832521130,2chrt18328-21latency_hist00:20:050
1552121130,2sleep015523-21cut21:00:430
1231321130,2chrt12314-21chrt23:22:030
456421120,2sleep04563-21seq23:59:310
2612521120,1sleep026128-21fschecks_time22:05:510
786021110,3chrt7861-21runrttasks19:56:000
315721110,1sleep03197-21sort21:31:160
1155821100,3chrt11557-21awk20:01:310
3271421060,2chrt32715-21fschecks_count22:15:480
243821050,2chrt2441-21runrttasks20:40:230
1135321040,3chrt11355-21sh21:43:420
1415521030,2chrt14156-21sh20:59:010
2871721010,3chrt28720-21apt-key00:35:130
167342970,2sleep016735-21chrt23:29:030
60402940,2sleep06041-21ssh22:24:370
183652940,2sleep018366-21chrt21:54:110
264412920,2sleep026442-21chrt22:55:260
185632880,1sleep018564-21chrt19:20:540
193092850,1sleep019310-21cat23:32:230
96702830,2sleep09671-21seq23:18:060
232912830,3chrt23278-21irqstats22:01:100
305032820,2sleep030504-21cat19:40:400
75562810,2sleep07558-21latency22:26:180
36012810,1sleep03598-21ssh23:09:500
303162810,2sleep030317-21seq21:23:280
193102810,3sleep019312-21cut00:21:030
254622800,2sleep025463-21collect223:41:440
326972790,1sleep032699-21chrt23:52:450
209442790,1sleep020945-21chrt21:57:250
1092390756,58cyclictest23114-21ntp_states21:13:110
1092390756,11cyclictest29297-21df_inode22:10:410
112352740,2sleep011236-21chrt00:09:330
1092390747,47cyclictest15683-21ntpq19:16:190
1092390746,11cyclictest28855-21df20:30:270
1092390744,59cyclictest31165-21/usr/sbin/munin21:26:070
209162730,1sleep020918-21seq21:10:090
1092390737,56cyclictest3947-21apt-get23:10:220
1092390736,46cyclictest6138-21memory00:01:140
1092390735,58cyclictest11651-21ssh22:32:220
1092390735,12cyclictest4682-21ntpq19:50:510
1092390734,59cyclictest21950-21apt-key00:25:130
10923907316,46cyclictest21513-21rm22:47:180
10923907310,54cyclictest21857-21ntpq23:36:180
1092390726,58cyclictest28979-21seq23:47:080
10923907216,44cyclictest439-21sh20:35:130
10923907210,53cyclictest9087-21cat20:50:410
1092390716,13cyclictest23479-21df_inode22:50:460
1092390715,57cyclictest20461-21ntpq20:16:140
1092390715,56cyclictest17590-21ntpq22:41:160
1092390714,10cyclictest21669-21ntpq19:25:550
10923907115,47cyclictest30099-21df23:00:390
177712700,2sleep017772-21seq20:11:340
1092390705,9cyclictest23689-21apt-get19:30:120
1092390704,56cyclictest6287-21sed21:36:100
1092390704,11cyclictest25844-21ntpq21:16:410
1092390696,9cyclictest23172-21irqrtprio20:20:430
1092390695,12cyclictest12543-21memory19:11:410
1092390694,9cyclictest14310-21ntpq20:06:190
1092390684,10cyclictest436-21runrttasks19:36:100
10923906510,46cyclictest10988-21sort19:10:050
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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