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2026-05-17 - 14:12

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 Sun May 17, 2026 00:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2787721290,3chrt27878-21runrttasks23:17:050
1621521250,2chrt16216-21/usr/sbin/munin00:36:170
3035921220,3chrt30360-21if_eth023:21:020
2582921200,2chrt25828-21seq23:14:330
99921150,3chrt996-21ssh00:14:370
892121140,2sleep08922-21if_err_can022:01:030
500921140,2sleep05015-21gcc21:05:520
336521130,2chrt3363-21if_can022:41:000
375421110,3chrt3752-21sshd21:04:550
797721100,2chrt7978-21latency_hist00:25:070
2067721090,2chrt20678-21chrt22:18:250
1984921090,2chrt19833-21ntpq19:46:010
2115021080,2sleep021152-21fschecks_time21:30:560
1404021080,1sleep014041-21runrttasks22:08:330
929021070,3chrt9292-21wc19:30:010
2382721070,2chrt23828-21sleep19:52:310
284652990,2sleep028467-21grep20:00:350
303642970,1sleep030365-21cat00:10:040
37502930,3sleep03752-21seq23:30:100
29152900,2sleep02916-21ssh21:51:430
144762890,2sleep014479-21fschecks_time23:45:510
261142860,2sleep026115-21sh22:26:190
244182850,2sleep024417-21cut21:35:540
256092810,2sleep025607-21seq19:55:430
181432810,2sleep018145-21ld23:03:000
274442790,2sleep027446-21aten2.4-expect21:40:360
36332770,1sleep03636-21chrt23:30:080
133392770,2sleep013340-21chrt21:19:220
325852760,2sleep032587-21grep20:06:250
22592760,2sleep02261-21fschecks_time20:10:340
235812750,2sleep023582-21seq23:59:510
91182710,2sleep09119-21chrt23:37:200
8332710,2sleep0834-21seq21:49:000
270262680,2sleep027027-21chrt00:05:020
119942680,2sleep011995-21chrt22:53:590
20622630,2sleep02063-21sh00:16:010
154772630,1sleep015478-21ntp_states21:22:060
240582620,2sleep024059-21seq20:45:220
175832580,2sleep017585-21grep23:50:380
222712574,42sleep020898-21/usr/sbin/munin20:41:240
118732570,2sleep011874-21chrt23:41:260
61692560,2sleep06170-21chrt20:16:130
283122560,2sleep028314-21ntp_offset20:51:070
153122563,44sleep015316-21df_inode20:31:210
219102553,41sleep021981-21sort22:20:380
125552550,1sleep012556-21chrt19:35:220
104502550,3sleep010447-21ssh00:28:100
88302540,2sleep08833-21cut20:20:440
64902540,3sleep06492-21grep22:45:490
301322520,2sleep030135-21cut19:10:440
156402523,39sleep015655-21if_err_eth222:11:070
312652513,41sleep031270-21chrt22:34:390
79212500,2sleep07919-21ssh21:59:550
14372500,2sleep01474-21mailstats22:38:030
29270904918,24cyclictest0-21swapper23:09:580
2741624912,21sleep027418-21ntpq19:05:520
185782490,1sleep018579-21ld21:26:390
29270904719,20cyclictest0-21swapper21:13:580
143022473,36sleep014286-21munin-run20:30:020
30372460,1sleep03040-21wc19:20:030
29270904615,23cyclictest0-21swapper22:58:090
2927090446,19cyclictest16500-21irqstats19:40:470
29270904419,9cyclictest412-21snmpd00:33:520
29270904316,11cyclictest19531-21runrttasks20:36:490
29270904216,17cyclictest9456-21/usr/sbin/munin19:30:460
29270904118,15cyclictest0-21swapper19:20:110
2927090395,17cyclictest30583-21diskstats20:55:340
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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