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2026-04-11 - 18:11

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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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 Sat Apr 11, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2090921260,2chrt20910-21runrttasks10:02:380
2304121230,4chrt23042-21runrttasks11:42:540
2751521210,3sleep027516-21runrttasks09:24:500
2333921200,3chrt23342-21runrttasks10:06:450
549821180,2sleep05500-21seq10:28:160
1708621180,3chrt17087-21runrttasks11:34:360
757521160,3chrt7574-21ld08:01:250
232421160,2sleep02325-21chrt10:23:370
2226121150,2sleep022260-21seq10:53:170
1710821140,3chrt17107-21ld09:57:130
1217621140,1sleep012200-21fschecks_time12:15:530
784121130,2sleep07842-21chrt12:09:280
152521110,2sleep01526-21chrt09:34:200
2811721080,2sleep028119-21rm12:39:550
1470721070,3chrt14706-21sshd09:53:500
1610721060,2sleep016110-21runrttasks08:15:420
2829821010,2chrt28299-21sh07:43:160
2209621010,2sleep022098-21chrt09:16:100
80522990,2chrt8053-21sh08:54:400
185822950,2sleep018585-21sed11:36:110
264432930,2sleep026446-21irqrtprio10:11:040
184392910,2sleep018440-21chrt12:25:160
175982900,1sleep017600-21sh10:46:460
134272870,1sleep013428-21missed_timers08:10:510
112112850,4sleep011207-21sshd08:59:500
3592820,2sleep0360-21seq11:09:440
82032800,2sleep08204-21seq11:20:590
254812790,2sleep025483-21seq08:30:430
12262780,2sleep01227-21cut11:10:510
90812770,2sleep09082-21chrt10:33:540
232522760,2sleep023254-21seq07:35:330
326812740,1sleep032679-21timerandwakeup11:57:200
120692740,2sleep012070-21seq10:38:060
85772700,2sleep08547-21pluginstate09:45:040
129262700,1sleep012928-21chrt11:27:320
86202680,2sleep08626-21chrt07:11:140
290242650,2sleep029025-21ntpq09:26:200
150742613,7sleep014589-21/usr/sbin/munin09:05:360
131672572,7sleep013171-21sleep10:40:260
256442560,3sleep025638-21sshd11:46:510
231672562,8sleep023162-21ssh10:55:110
148462563,6sleep014842-21ntpq07:21:150
247342550,3sleep024731-21ssh12:34:450
160462543,42sleep014737-21apt-get12:21:410
302672520,2sleep030266-21seq11:54:220
117512520,1sleep011752-21grep09:00:250
97912512,6sleep09713-21ssh09:46:120
27272513,8sleep02732-21chrt07:54:360
196632510,3chrt19661-21/usr/sbin/munin08:20:520
292062502,5sleep029211-21ssh11:03:590
7204904912,12cyclictest11071-21if_eth007:15:410
7204904820,21cyclictest0-21swapper12:12:280
176812470,1sleep017682-21runrttasks09:10:070
45182469,23sleep04526-21diskstats07:05:240
37372460,2chrt3735-21/usr/sbin/munin07:55:430
17132453,35sleep01701-21ssh12:00:260
720490436,10cyclictest2494-21diskstats09:35:510
720490436,10cyclictest22712-21memory08:25:470
291002430,3chrt29101-21runrttasks07:45:110
19042431,33sleep00-21swapper08:45:070
7204904216,11cyclictest5197-21ssh11:16:070
7204904116,18cyclictest10277-21load08:05:490
7204904115,8cyclictest31753-21aten2.4_rfpower08:41:150
720490404,17cyclictest28333-21sleep08:35:350
7204904017,15cyclictest0-21swapper10:18:130
720490384,8cyclictest20809-21ntpq07:30:520
720490374,27cyclictest17055-21diskstats07:25:340
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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