[RndTbl] Load average under RHEL 6.x systems?

[Kevin McGregor]

Other semi-random questions: Any processes in uninterruptible sleep? What
kind of video cards do the systems have? Anything weird in /proc/interrupts?

On Wed, Apr 11, 2012 at 6:24 PM, Kevin McGregor
<kevin.a.mcgregor at gmail.com>wrote:

> Which kernel version did you say they're running? Did you try running with
> "nohz=off"?
>
>
> On Wed, Apr 11, 2012 at 5:00 PM, Gilbert E. Detillieux <
> gedetil at cs.umanitoba.ca> wrote:
>
>> Howdy folks!
>>
>> I asked this at last night's meeting, as my "stumper of the month", but
>> didn't get any solutions or leads.  So, I thought I'd ask again here...
>>
>> After upgrading many of our systems, both workstations and servers, from
>> CentOS 5.x to Scientific Linux 6.x, I'm seeing higher load averages on idle
>> systems than I used to.  Under EL5, loads would drop to zero and pretty
>> much stay there most of the time for idles systems.  Under EL6, the load
>> might drop down to 0.1, but doesn't stay there for very long, and even on
>> seemingly idle systems, I see loads at or near 1 (sometimes even higher
>> than 1 on some of our servers).  It's also intermittent, with load averages
>> dropping and climbing on fairly short intervals (of a few minutes or so).
>>
>> Running top, iotop, ftop, iftop, etc. doesn't really point to any major
>> culprits.  I've even run PowerTop, and implemented some of its suggested
>> improvements, but that didn't make a difference on load.
>>
>> Just wondering if anyone else has seen similar behaviour with hosts
>> running Red Hat and/or Fedora distributions?  Would moving to the
>> "tickless" kernel have anything to do with it?  (I.e. does it somehow
>> affect the way load averages are calculated?)
>>
>> Or is it some system service that can be shut down?  (If it is, it's not
>> creating an obvious load on its own, that top or ftop would show, but it
>> may be affecting something in the kernel...)
>>
>> Any suggestions?
>>
>> --
>> Gilbert E. Detillieux           E-mail: <gedetil at muug.mb.ca>
>> Manitoba UNIX User Group        Web:    http://www.muug.mb.ca/
>> PO Box 130 St-Boniface          Phone:  (204)474-8161
>> Winnipeg MB CANADA  R2H 3B4     Fax:    (204)474-7609
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>
>
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