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xm list should show the change in the number of vCPUs assigned to a domU - it does on my Xen installations, anyway. You may need to set the "maxvcpus" parameter in the configuration file for your domU and delete and re-add the domU to Xen for this to work properly.
As long as you have the physical CPUs and/or cores to support 4 vCPUs, there should be no problem with this. I have four 8-core machines and have several domUs that run 4 vCPUs.
-Nick >>> On 2009/05/28 at 05:52, yassine ayachi <ayachi.yassine@xxxxxxxxx> wrote:
Hi all,
To increase a VM performance I launched the command xm vcpu-set domU 2 to add an other processor to my VM.
Where can I check if it works knowing that the command xm list dont show a changed cpu nember ?
[root@localhost ~]# xm list
Name ID Mem(MiB) VCPUs State Time(s)
Domain-0 0 4035 4 r----- 29851.8
domU 3 2047 1 r----- 96114.6
[root@localhost ~]# xm vcpu-set 3 2
[root@localhost ~]# xm list
Name ID Mem(MiB) VCPUs State Time(s)
Domain-0 0 4035 4 r----- 29852.2
domU 3 2047 1 r----- 96137.4
An other question, is it healthy that I set more than 2 processors (4 for example) ?
Thanks in advance.
--
Yassine AYACHI
Ingénieur réseaux et systèmes
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