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

[Kevin McGregor]

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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