Re: [Xen-users] about xm vcpu-set

[Yassine AYACHI <yassinegtr4@xxxxxxxxx>]

Thanks for replay,

You're right, I assigned 4 vcpus and my VM load average decreased remarkably.

Only one trick to report the VM must be shutdown then start and not restart.

Thanks again,

2009/5/28 Nick Couchman <Nick.Couchman@xxxxxxxxx>

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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--
Yassine AYACHI
Ingénieur réseaux et systèmes

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