--- Original message ---
From: "Коньков Евгений"
To: "wishmaster"
Date: 25 December 2011, 18:10:22
Subject: Re[4]: high load system do not take all CPU time
> Здравствуйте, wishmaster.
>
> Вы писали 19 декабря 2011 г., 6:54:08:
>
>
>
> w> --- Original message ---
> w> From: "Коньков Евгений"
> w> To: "Daniel Staal"
> w> Date: 18 December 2011, 19:47:40
> w> Subject: Re[2]: high load system do not take all CPU time
> w>
> w>
>
>
> >> Здравствуйте, Daniel.
> >>
> >> Вы писали 18 декабря 2011 г., 17:52:00:
> >>
> >> DS> --As of December 17, 2011 10:29:42 AM +0200, Коньков Евгений
> >> DS> is alleged to have said:
> >>
> >> >> How to debug why system do not use free CPU resouces?
> >> >>
> >> >> On this pictures you can see that CPU can not exceed 400tics
> >> >> http://piccy.info/view3/2368839/c9022754d5fcd64aff04482dd360b5b2/
> >> >> http://piccy.info/view3/2368837/a12aeed98681ed10f1a22f5b5edc5abc/
> >> >> http://piccy.info/view3/2368836/da6a67703af80eb0ab8088ab8421385c/
> >> >>
> >> >>
> >> >> On these pictures you can see that problems begin with trafic on re0
> >> >> when CPU load rise to "maximum"
> >> >> http://piccy.info/view3/2368834/512139edc56eea736881affcda490eca/
> >> >> http://piccy.info/view3/2368827/d27aead22eff69fd1ec2b6aa15e2cea3/
> >> >>
> >> >> But there is 25% CPU idle yet at that moment.
> >>
> >> DS>
> >>
> >> >># top -SIHP
> >> >> last pid: 93050; load averages: 1.45, 1.41, 1.29
> >> >> up 9+16:32:06 10:28:43 237 processes: 5 running, 210 sleeping, 2
> >> >> stopped, 20 waiting
> >> >> CPU 0: 0.8% user, 0.0% nice, 8.7% system, 17.7% interrupt, 72.8% idle
> >> >> CPU 1: 0.0% user, 0.0% nice, 9.1% system, 20.1% interrupt, 70.9% idle
> >> >> CPU 2: 0.4% user, 0.0% nice, 9.4% system, 19.7% interrupt, 70.5% idle
> >> >> CPU 3: 1.2% user, 0.0% nice, 6.3% system, 22.4% interrupt, 70.1% idle
> >> >> Mem: 843M Active, 2476M Inact, 347M Wired, 150M Cache, 112M Buf, 80M
> >> >> Free
> >> >> Swap: 4096M Total, 15M Used, 4080M Free
> >>
> >> DS> --As for the rest, it is mine.
> >>
> >> DS> You are I/O bound; most of your time is spent in interrupts. The CPU
> >> is
> >> DS> dealing with things as fast as it can get them, but it has to wait for
> >> the
> >> DS> disk and/or network card to get them to it. The CPU is not your
> >> problem;
> >> DS> if you need more performance, you need to tune the I/O. (And possibly
> >> get
> >> DS> better I/O cards, if available.)
> >>
> >> DS> Daniel T. Staal
> >>
> >> can I get interrupt limit or calculate it before that limit is
> >> reached?
> >>
> >> interrupt source is internal card:
> >> # vmstat -i
> >> interrupt total rate
> >> irq14: ata0 349756 78
> >> irq16: ehci07427 1
> >> irq23: ehci1 12150 2
> >> cpu0:timer 18268704 4122
> >> irq256: re0 85001260 19178
> >> cpu1:timer 18262192 4120
> >> cpu2:timer 18217064 4110
> >> cpu3:timer 18210509 4108
> >> Total 158329062 35724
> >>
> >> Have you any good I/O tuning links to read?
> >>
> >> --
> >> С уважением,
> >> Коньков mailto:kes-...@yandex.ru
> w>
> w> Your problem is in the poor performance LAN Card. Guy from
> w> Calomel Org told you about it. He advised you to change to Intel Network
> Card.
>
> see at time 17:20
> http://piccy.info/view3/2404329/dd9f28f8ac74d3d2f698ff14c305fe31/
>
> at this point freeradius start to work slow because of no CPU time is
> allocated to it or is allocated to little and mpd5 start to drop users
> because of no response
> from radius. I do not know what idle were on 'top', sadly.
>
> does SNMP return right values for CPU usage?
>
Here is some interesting articles about performance, mpd and others. Read
it.
http://dadv.livejournal.com/138951.html
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