>Number:         153674
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>Category:       kern
>Synopsis:       i386/XEN idle thread shows wrong percentages
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Jan 04 12:50:09 UTC 2011
>Closed-Date:
>Last-Modified:
>Originator:     Florian Smeets
>Release:        FreeBSD 9.0-CURRENT
>Organization:
>Environment:
FreeBSD ec2 9.0-CURRENT FreeBSD 9.0-CURRENT #111: Sat Jan  1 09:45:23 UTC 2011     root@chch.daemonology.net:/usr/obj/i386.i386/usr/src/sys/XEN  i386

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>Description:
>From time to time the idle thread does not seem to get accounted correctly, it goes through the roof and then comes down slowly, but only in top's process list. The header seems correct.

CPU:  0.0% user,  0.0% nice,  0.0% system,  0.0% interrupt,  100% idle

  PID USERNAME  THR PRI NICE   SIZE    RES STATE    TIME   WCPU COMMAND


   11 root        1 171 ki31     0K     8K RUN     19.1H 24566.89% idle
   12 root       11 -64    -     0K    88K WAIT     1:28  2.00% intr
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>How-To-Repeat:
I've seen this on an EC2 instance running ami-5b82b72f. This seems to happen when the instance has been idle for a while and suddenly has do to some work.
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>Fix:


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>Release-Note:
>Audit-Trail:
>Unformatted:
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