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Strange display of CPU usage

From: Marcus Mülbüsch, AS-Infodienste GmbH (Systemadministration)
Subject: Strange display of CPU usage
Date: Tue, 14 Sep 2010 14:16:20 +0200
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv: Gecko/20100825 Thunderbird/3.1.3

I have it seen sometimes, shortly after I start monit and issue a 'monit summary' that the CPU usage lists negative values:

System 'name.tld'
  status                            running
  monitoring status                 monitored
  load average                      [0.00] [0.11] [0.15]
  cpu                               -1.0%us -1.0%sy -1.0%wa
  memory usage                      603584 kB [15.2%]
  data collected                    Tue Sep 14 14:00:41 2010

This is not exactly serious, as it disappears after the first minute; but can it be true? Do I miss something of how CPU resources are really measured?

Using "This is monit version 5.1.1" on "2.6.22-vs2.2.0.7-gentoo" inside a VServer guests (but it happens on the VServer host, too.)


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