[Xen-users] How to explain Xenmon result

[Lei Lu <lulei.wm@xxxxxxxxx>]

Hi all,

I am trying to use xenmon.py to monitor cpu utilization of my machine.
Machine has 2 cores.

[root@xxx script]# xm vcpu-list
Name            ID  VCPU   CPU State   Time(s) CPU Affinity
Domain-0      0     0     0   -b-   73753.3 any cpu
Domain-0      0     1     1   r--   63252.4 any cpu
webserver     4     0     1   -b-    5761.9 any cpu

I ran xenmon.py with interval time set to 5 seconds and and let it run
indefinitely and log into local files by executing the command:
[root@xxxx script]# xenmon.py -n -i 5000 -t 0

The log files xenmon automatically generates are "log-dom0.log"
"log-dom2.log"  "log-idle.log", then the result will be in
log-dom2.log looks like the following:

[root@xxxx script]# more log-dom2.log |awk '{print $1, $2, $5,$9, $12}'
#passed cpu cpu(%) blocked(%) waited(%)
0.000 0 0.000 0.000 0.000
11.470 1 0.000 0.000 0.000
5013.090 1 1.919 98.073 0.006
5015.670 0 0.104 52.173 0.092
10014.038 1 1.957 45.017 0.055
10016.627 0 1.473 75.309 0.004
15014.840 1 0.460 21.995 0.001
15017.386 0 0.782 37.692 0.116
20015.507 1 1.303 59.982 0.003
20018.086 0 0.208 15.147 0.003
25016.194 1 1.722 83.039 0.005
25018.832 0 0.664 78.986 0.151
30017.152 1 1.467 20.051 0.085

It has so many cases that cpu(%)+blocked(%)+waited(%) not equal or
even close to 100%. I read "XenMon: QoS Monitoring and Performance
Profiling Tool" paper, but still can not figure it out. Especially,
what does the waited(%) mean?

I even find waited(%) more than 100 in some case. How to explain all these?

cpu(%) blocked(%) waited(%)
25.316506  67.791463   176.436726

Thank you in advance

Best,
Lei

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