Bug#888465: CPU usage reporting issues
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
11:05:01 AM all 0.01 0.00 0.02 0.00 0.00 99.97
11:15:01 AM all 0.01 0.00 0.02 0.00 0.00 99.97
11:25:01 AM all 0.01 0.00 0.02 0.00 0.00 99.97
11:35:01 AM all 0.01 0.00 0.02 0.00 0.00 99.97
11:45:01 AM all 0.01 0.00 0.02 0.00 0.00 99.97
11:55:01 AM all 0.01 0.00 0.02 0.00 0.00 99.97
12:05:01 PM all 0.01 0.00 0.01 0.00 0.00 99.97
12:15:01 PM all 0.01 0.00 0.01 0.00 0.00 99.97
12:25:01 PM all 0.01 0.00 0.02 0.00 0.00 99.97
12:25:01 PM CPU %user %nice %system %iowait %steal %idle
12:35:01 PM all 0.01 0.00 0.02 0.00 0.00 99.97
12:45:01 PM all 0.01 0.00 0.02 0.00 0.00 99.97
12:55:01 PM all 0.02 0.00 0.02 0.00 0.00 99.96
01:05:01 PM all 0.01 0.00 0.02 0.00 0.00 99.97
01:15:01 PM all 0.00 0.00 0.00 0.00 100.00 0.00
01:25:01 PM all 0.00 0.00 0.00 0.00 0.00 0.00
01:35:01 PM all 0.00 0.00 0.00 0.00 0.00 0.00
01:45:01 PM all 0.00 0.00 0.00 0.00 100.00 0.00
01:55:01 PM all 0.00 0.00 0.00 0.00 0.00 0.00
02:05:01 PM all 0.00 0.00 0.00 0.00 0.00 0.00
02:15:01 PM all 0.00 0.00 0.00 0.00 100.00 0.00
02:25:01 PM all 0.00 0.00 0.00 0.00 0.00 0.00
02:35:01 PM all 0.00 0.00 0.00 0.00 0.00 0.00
02:45:01 PM all 0.00 0.00 0.00 0.00 100.00 0.00
02:55:01 PM all 0.00 0.00 0.00 0.00 0.00 0.00
Reply to: