Hi all.

I'm wondering if anyone has seen this behaviour before.  The system load is
quite low, but not abnormally low.  This machine normally stays between 0.5
and 2 during the day.  However, the CPU states are split between user and
system, there is no idle at all.  Here's an excerpt from top:

  6:15pm  up 105 days,  3:27,  4 users,  load average: 0.62, 0.50, 0.57
185 processes: 180 sleeping, 2 running, 3 zombie, 0 stopped
CPU0 states: 62.0% user, 37.0% system,  0.0% nice,  0.0% idle
CPU1 states: 54.0% user, 45.0% system,  0.0% nice,  0.0% idle
CPU2 states: 24.0% user, 75.0% system,  0.0% nice,  0.0% idle
CPU3 states: 50.0% user, 50.0% system,  0.0% nice,  0.0% idle

(It's not really a quad, it's a dual Xeon with hyperthreading.)

Only a few days ago, this machine had about 80% idle on all four CPUs.

There are no long running processes eating up CPU load, the highest load is
about 1.5%, and the largest memory sucker is eating up at most 2.3% of total
RAM.  It's running apache and mysql, which are behaving normally for a
machine serving a lot of traffic.

So, I'm interested why the CPU isn't idling so much and the load isn't
higher than it ought to be.

Ideas and urls graciously accepted.
  
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