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2026-05-23 - 22:10

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 Sat May 23, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1366621420,2sleep013667-21sendmail_mailqu11:32:160
3164121310,2sleep031642-21seq09:34:040
726121260,2chrt7263-21missed_timers08:56:410
3176221240,3chrt31761-21ssh11:11:220
134621220,2chrt1334-21ntpq12:02:240
3236821200,2chrt32367-21seq08:45:340
2319721200,3chrt23192-21aten2.4-expect12:35:330
483521170,2chrt4833-21swap12:07:200
2810821170,2chrt28109-21/usr/sbin/munin11:05:520
2359021150,2chrt23565-21ntpq09:21:330
2055321150,2chrt20552-21seq10:54:470
1555321150,3chrt15552-21ssh09:10:150
1823721140,2chrt18236-21ld10:02:130
1507021140,2chrt15069-21/usr/sbin/munin12:22:220
1494221130,2chrt14943-21sleep09:08:590
250121120,2chrt2499-21ld10:27:140
1560221120,3chrt15603-21runrttasks09:58:200
1137921110,2chrt11378-21sshd07:20:060
1924521100,2sleep019246-21seq12:29:240
853221070,3chrt8533-21runrttasks11:25:070
765121050,2chrt7652-21sh11:23:180
1217521010,3chrt12176-21sh08:12:540
94982980,2sleep09499-21ssh09:49:410
108242980,2chrt10825-21sh09:01:430
219182950,2sleep021920-21chrt12:32:520
70302820,2sleep07031-21chrt08:05:240
176792800,1sleep017680-21chrt07:30:220
36542790,1sleep03656-21lockfile-remove08:00:020
293532750,1sleep029354-21seq10:19:130
196272740,2sleep019628-21cat09:16:040
22842730,2sleep02285-21seq11:15:360
224622730,2sleep022463-21chrt10:57:020
67742720,1sleep06776-21sort08:05:020
145252700,2sleep014526-21seq07:25:130
72382690,1sleep07239-21seq07:12:380
152482660,2sleep015249-21seq11:35:230
83192640,2sleep08321-21seq10:36:070
283522630,1sleep028353-21seq11:54:530
50612620,1sleep05170-21cut10:31:100
287682610,2sleep028767-21seq09:30:040
213342596,7sleep021337-21seq11:44:200
103372583,8sleep010354-21cut09:50:530
289712573,44sleep029035-21aten2.4-expect08:40:240
272442573,7sleep027266-21df07:45:280
235572573,44sleep023581-21cut08:30:480
158042560,1sleep015805-21seq10:47:040
273512553,43sleep027417-21sed08:36:320
224022553,43sleep022428-21cut11:45:560
17712552,43sleep01799-21timerandwakeup09:37:300
244802530,2sleep024481-21seq10:11:250
313412523,42sleep031337-21ssh10:21:430
304102523,7sleep030414-21diskstats07:50:340
29792523,7sleep02985-21df_inode08:50:310
44872512,41sleep04470-21ntpq09:41:330
38922516,34sleep0412-21snmpd07:07:020
287612500,1sleep028764-21tail11:55:330
114882483,37sleep011499-21ntpq12:17:290
5038904717,23cyclictest0-21swapper11:03:430
115802470,3chrt11578-21/usr/sbin/munin10:41:030
5038904617,21cyclictest0-21swapper10:08:140
170662460,3chrt17067-21fschecks_count08:21:040
131792443,33sleep013118-21apt-get08:15:220
503890435,11cyclictest7879-21ssh12:12:050
503890434,11cyclictest24178-21df07:40:290
5038904321,15cyclictest0-21swapper07:35:390
5038904110,22cyclictest22488-21latency_hist08:30:030
503890376,11cyclictest9257-21memory07:15:490
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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