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Groups > linux.debian.bugs.dist > #877718

Bug#888465: CPU usage reporting issues

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Package: linux-image-4.9.0-5-amd64
Version: 4.9.65-3+deb9u2
Severity: normal

Hi,

I'm having an issue with CPU usage reporting, tested on kernels 4.9.0-3 
and 4.9.0-5.  The machines are running on Amazon EC2, which could be 
related.  With the "sar" utility, after some time, the system's "steal" 
value periodically is 100%, and the normal CPU user/system values, 
including idle, are always 0.  When running a cpu-intensive app and 
using the "top" utility, the user and system values are always 0, the 
"idle" field stays at 100%, and only the "wait" field increases.

The attached file shows the "sar" output around the time the issue 
started.  This has happened on 2 separate machines (started at different 
times on each), and a reboot appears to (temporarily) fix the issue.  
I'm wondering if anyone else has this issue, and if it could be 
something to do with the hypervisor.

-- 
Ryan Thoryk
ryan@thoryk.com
ryan@tliquest.net

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Bug#888465: CPU usage reporting issues Ryan Thoryk <ryan@thoryk.com> - 2018-01-26 00:30 +0100
  Bug#888465: Additional example Ryan Thoryk <ryan@thoryk.com> - 2018-01-26 00:50 +0100
  Bug#888465: CPU usage reporting issues Hans van Kranenburg <hans@knorrie.org> - 2018-01-26 01:00 +0100
    Bug#888465: CPU usage reporting issues Ryan Thoryk <ryan@thoryk.com> - 2018-01-26 01:20 +0100
    Bug#888465: CPU usage reporting issues Ryan Thoryk <ryan@thoryk.com> - 2018-01-26 01:20 +0100

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