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Date: Sat, 5 Nov 2011 09:13:01 +0100 From: Paweł Sikora <pluto@...k.net> To: linux-kernel@...r.kernel.org Cc: mingo@...e.hu, peterz@...radead.org, arekm@...-linux.org, nai.xia@...il.com Subject: big [migration/X] cpu time. Hi, i'm testing a dual opteron machine (2x8 cores + 2x32GB ram) for 10 days so far with quite heavy cpu processing and basic i/o usage (storing/accessing data over nfs and local stripped raid). during tests i've recorded some interesting thing related to migration/X kernel processes: [root@hal ~]# uname -a Linux hal 3.0.8-vs2.3.1-dirty #6 SMP Tue Oct 25 10:07:50 CEST 2011 x86_64 AMD_Opteron(tm)_Processor_6128 PLD Linux [root@hal ~]# uptime 08:19:40 up 10 days, 19:53, 4 users, load average: 13.21, 13.11, 13.14 [root@hal ~]# ps aux|grep migra root 6 0.0 0.0 0 0 ? S Oct25 0:00 [migration/0] root 8 97.1 0.0 0 0 ? S Oct25 15151:59 [migration/1] root 13 33.3 0.0 0 0 ? S Oct25 5202:15 [migration/2] root 17 98.1 0.0 0 0 ? S Oct25 15309:01 [migration/3] root 21 66.5 0.0 0 0 ? S Oct25 10370:14 [migration/4] root 25 62.1 0.0 0 0 ? S Oct25 9698:11 [migration/5] root 29 65.9 0.0 0 0 ? S Oct25 10283:22 [migration/6] root 33 58.9 0.0 0 0 ? S Oct25 9190:28 [migration/7] root 37 0.0 0.0 0 0 ? S Oct25 0:00 [migration/8] root 41 91.9 0.0 0 0 ? S Oct25 14338:30 [migration/9] root 45 27.5 0.0 0 0 ? S Oct25 4290:00 [migration/10] root 49 64.6 0.0 0 0 ? S Oct25 10081:38 [migration/11] root 53 98.9 0.0 0 0 ? S Oct25 15435:34 [migration/12] root 57 65.8 0.0 0 0 ? S Oct25 10272:57 [migration/13] root 61 65.6 0.0 0 0 ? S Oct25 10232:29 [migration/14] root 65 66.7 0.0 0 0 ? S Oct25 10403:09 [migration/15] [root@hal ~]# ps aux|grep irq root 3 0.0 0.0 0 0 ? S Oct25 1:18 [ksoftirqd/0] root 10 0.0 0.0 0 0 ? S Oct25 1:07 [ksoftirqd/1] root 15 0.0 0.0 0 0 ? S Oct25 1:09 [ksoftirqd/2] root 19 0.0 0.0 0 0 ? S Oct25 1:19 [ksoftirqd/3] root 23 0.0 0.0 0 0 ? S Oct25 1:30 [ksoftirqd/4] root 27 0.0 0.0 0 0 ? S Oct25 1:15 [ksoftirqd/5] root 31 0.0 0.0 0 0 ? S Oct25 1:18 [ksoftirqd/6] root 35 0.0 0.0 0 0 ? S Oct25 1:23 [ksoftirqd/7] root 39 0.0 0.0 0 0 ? S Oct25 1:44 [ksoftirqd/8] root 43 0.0 0.0 0 0 ? S Oct25 1:23 [ksoftirqd/9] root 47 0.0 0.0 0 0 ? S Oct25 1:20 [ksoftirqd/10] root 51 0.0 0.0 0 0 ? S Oct25 1:18 [ksoftirqd/11] root 55 0.0 0.0 0 0 ? S Oct25 1:20 [ksoftirqd/12] root 59 0.0 0.0 0 0 ? S Oct25 1:06 [ksoftirqd/13] root 63 0.0 0.0 0 0 ? S Oct25 1:06 [ksoftirqd/14] root 67 0.0 0.0 0 0 ? S Oct25 1:10 [ksoftirqd/15] root 961 0.0 0.0 0 0 ? S Oct25 0:00 [irq/40-AMD-Vi] root 2824 0.0 0.0 9628 436 ? Ss Oct25 2:51 irqbalance as you can see 14 migration processes [1..7, 9..15] eat from 71 to 256 cpu-hours and 2 migration processes [0, 8] sleep well. i'm not sure what causes such migration during only 10 days of uptime. is it a bug in scheduler, kernel misconfiguration or an ugly side effect of irqbalance daemon? thanks in advance for any hints. BR, Paweł. View attachment "proc.cpuinfo.txt" of type "text/plain" (14366 bytes) View attachment "proc.interrupts.txt" of type "text/plain" (9699 bytes) View attachment "proc.config.txt" of type "text/plain" (131044 bytes)
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