On Wed, Jun 03, 2009 at 10:07:33PM -0700, patrick keshishian wrote:
> On Wed, Jun 3, 2009 at 3:50 AM, Richard Toohey
> <richardtoo...@paradise.net.nz> wrote:
> > On 3/06/2009, at 10:02 PM, BARDOU Pierre wrote:
> >
> >> Hello,
> >>
> >> I have performance issues on a OpenBSD 4.4 firewall.
> >> CPU load is OK (always below 50%), but system load is always between 1 and
> >> 1.5, it may go up to 2 sometimes.
> >>
> > [cut]
> >
> > And what is the actual *problem*?
> >
> > What is pf failing to do?
> >
> > Or are you just worried about the numbers? B Search the archives for "high
> > load" ...
> 
> just for the record, i have seen a server where its typical load
> floats around 0.10 or so, but then something will happen and the
> plateau will get bumped to 1.10 and remain there. this was an 4.5
> system.

A sudden, significant, "permanent" change in load merely says that
something happened that may be interesting. It doesn't tell you anything
about what happened or if it's even a problem.

> I have not identified what "event" caused this. I've seen similar
> issue with a couple of linux boxes at work where the load avg plateau
> will keep rising: it'll hover around ~3, then say ~6 then ~13. i don't
> think the issues are related, but could be caused by similar bugs in
> kernel.

I've seen this too over the years on *BSD and Linux or a variety of
machines. Usually a few minutes with top(1), systat(1), et al will show
you what's going on. Until you find out there's not much to do.

A change in load is like getting a billing statement with "Important:
changes to your account" printed on the envelope. You can run around
waving the envelope asking what changed, or you can look inside and find
out.

> All systems continue to be responsive and it only seems that the
> reported load avg value is just bumped by a base value. It is
> definitely odd.

So it's not a problem... yet. It may never be a problem. Or it could be.
Open the envelope and spend a few minutes reading the contents. ;-)

-- 
Darrin Chandler            |  Phoenix BSD User Group  |  MetaBUG
dwchand...@stilyagin.com   |  http://phxbug.org/      |  http://metabug.org/
http://www.stilyagin.com/  |  Daemons in the Desert   |  Global BUG Federation

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