1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
graphic: 0.921
device: 0.828
performance: 0.820
semantic: 0.558
other: 0.248
network: 0.220
KVM: 0.183
vnc: 0.144
debug: 0.122
PID: 0.090
boot: 0.059
socket: 0.026
permissions: 0.016
files: 0.015
always zero when query-dirty-rate
Description of problem:
The creation of VM works well(by virt-install), and I can enter it by 'virsh console or ssh'.
Now, I try to use qemu's feature: calc-dirty-rate.
But, always get '"dirty-rate":0' when 'query-dirty-rate', occasionally '"dirty-rate":2'.
At the same time, I run 'mbw'(mbw -t0 -n 1000000 1024 -q) in vm, a memcpy-intensive benchmark.
I'm not sure if some configurations of QEMU/KVM are not enabled.
looking forward to your reply!
Steps to reproduce:
```
1. virsh qemu-monitor-command centos-huazhang '{"execute":"calc-dirty-rate", "arguments": {"calc-time": 1}}'
{"return":{},"id":"libvirt-16"}
2. virsh qemu-monitor-command centos-huazhang1 '{"execute":"query-dirty-rate"}'
{"return":{"status":"measured","sample-pages":512,"dirty-rate":0,"mode":"page-sampling","start-time":607266,"calc-time":1},"id":"libvirt-17"}
```
|