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2026-08-07 - 00:24

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 all highest latencies:
System rackfslot4s.osadl.org (updated Thu Aug 06, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1714221260,2chrt17145-21seq12:00:010
120421210,3chrt1205-21seq11:36:060
1429521200,2sleep014296-21seq09:29:410
3227321190,3chrt32275-21latency_hist07:25:000
2968921190,2chrt29691-21sh11:30:310
2802921140,2chrt28027-21seq11:27:130
1177321140,3chrt11771-21ssh11:03:000
1701121110,2chrt17012-21seq09:33:140
75721090,2chrt758-21sleep12:23:440
2866121070,2chrt28662-21ssh10:40:090
2073621050,2chrt20737-21sh08:49:490
865921020,1sleep08662-21cut11:46:510
3126921010,2sleep031270-21seq09:55:180
935421000,2sleep09357-21cut09:21:520
192762990,2sleep019274-21tune2fs07:55:360
259012950,2chrt25902-21sh08:56:530
78112930,2sleep07812-21collect210:57:070
26702910,1sleep02671-21chrt09:12:090
238632900,2sleep023866-21cut10:32:140
243692890,2sleep024370-21chrt07:11:110
251152830,2sleep025116-21tune2fs09:45:500
255202820,2sleep025522-21cut08:05:340
173322820,2sleep017333-21seq12:00:080
136622810,2sleep013664-21seq07:45:510
4442770,2sleep0447-21cut10:46:050
65222750,2sleep06525-21wc12:32:110
67462740,2sleep06747-21chrt07:35:280
191962730,2sleep019193-21entropy10:25:500
49782710,1sleep04979-21seq10:52:400
181142670,2sleep018115-21seq11:12:210
220992660,2sleep022101-21rm12:06:410
136292650,1sleep013630-21chrt11:54:350
285562610,2sleep028558-21wc10:40:050
296322600,1sleep029633-21chrt12:18:080
59342590,2sleep05936-21sort09:16:580
324242590,2sleep032425-21chrt08:16:030
84532580,2sleep08454-21seq10:09:490
262432570,2sleep026244-21ssh12:12:580
96662540,2sleep09668-21ld12:36:550
27612543,7sleep02753-21ssh10:00:570
223742543,8sleep022434-21perl08:00:360
34232530,5chrt3421-21/usr/sbin/munin12:27:190
240352500,1sleep024036-21seq11:21:470
22977905020,23cyclictest0-21swapper11:19:290
22977905019,23cyclictest0-21swapper09:00:250
22977904920,22cyclictest0-21swapper11:43:430
22977904820,21cyclictest0-21swapper09:53:010
22977904817,23cyclictest0-21swapper10:12:590
22977904815,25cyclictest0-21swapper07:26:270
2112224812,21sleep021124-21ntpq07:05:510
167752480,2chrt16757-21ntpq07:50:520
291882470,3chrt29189-21runrttasks08:10:500
223162473,7sleep022322-21/usr/sbin/munin09:41:070
167502462,6sleep016759-21ntpq10:21:320
107602460,2sleep010761-21seq07:41:080
47302450,3sleep04721-21ntpq07:31:490
272592450,2chrt27260-21runrttasks07:15:520
22977904515,23cyclictest0-21swapper11:09:140
100492440,1sleep010101-21cat08:32:140
2297790435,10cyclictest7971-21munin-run08:30:030
2297790434,11cyclictest13246-21ntpq10:16:160
2297790416,27cyclictest20995-21/usr/sbin/munin08:50:230
2297790415,17cyclictest30963-21cat09:05:420
2297790414,11cyclictest15479-21diskstats08:41:240
22977904112,10cyclictest18393-21diskstats09:35:440
22977903812,20cyclictest1942-21apt-get08:20:200
22977903812,20cyclictest11793-21sh08:35:290
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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