[OpenIndiana-discuss] Problem with high cpu load (oi_151a)

Rennie Allen rennieallen at gmail.com
Thu Oct 20 17:27:17 UTC 2011

Dontchya just love dtrace?

On 10/20/11 10:22 AM, "Michael Stapleton"
<michael.stapleton at techsologic.com> wrote:

>Hi Gernot,
>You have a high context switch rate.
>#dtrace -n 'sched:::off-cpu { @[execname]=count()}'
>For a few seconds to see if you can get the name of and executable.
>On Thu, 2011-10-20 at 18:44 +0200, Gernot Wolf wrote:
>> Hello all,
>> I have a machine here at my home running OpenIndiana oi_151a, which
>> serves as a NAS on my home network. The original install was
>> 2009.6 which was later upgraded to snv_134b, and recently to oi_151a.
>> So far this OSOL (now OI) box has performed excellently, with one major
>> exception: Sometimes, after a reboot, the cpu load was about 50-60%,
>> although the system was doing nothing. Until recently, another reboot
>> solved the issue.
>> This does not work any longer. The system has always a cpu load of
>> 50-60% when idle (and higher of course when there is actually some work
>> to do).
>> I've already googled the symptoms. This didn't turn up very much useful
>> info, and the few things I found didn't apply to my problem. Most
>> noticably was this problem which could be solved by disabling cpupm in
>> /etc/power.conf, but trying that didn't show any effect on my system.
>> So I'm finally out of my depth. I have to admit that my knowledge of
>> Unix is superficial at best, so I decided to try looking for help here.
>> I've run several diagnostic commands like top, powertop, lockstat etc.
>> and attached the results to this email (I've zipped the results of
>> because they were >1MB).
>> One important thing is that when I boot into the oi_151a live dvd
>> instead of booting into the installed system, I also get the high cpu
>> load. I mention this because I have installed several things on my OI
>> box like vsftpd, svn, netstat etc. I first thought that this problem
>> might be caused by some of this extra stuff, but getting the same
>> when booting the live dvd ruled that out (I think).
>> The machine is a custom build medium tower:
>> S-775 Intel DG965WHMKR ATX mainbord
>> Intel Core 2 Duo E4300 CPU 1.8GHz
>> 1x IDE DVD recorder
>> 1x IDE HD 200GB (serves as system drive)
>> 6x SATA II 1.5TB HD (configured as zfs raidz2 array)
>> I have to solve this problem. Although the system runs fine and
>> absolutely serves it's purpose, having the cpu at 50-60% load
>> is a waste of energy and surely a rather unhealthy stress on the
>> Anyone any ideas...?
>> Regards,
>> Gernot Wolf
>> _______________________________________________
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>> OpenIndiana-discuss at openindiana.org
>> http://openindiana.org/mailman/listinfo/openindiana-discuss
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