Re: [Xen-users] SMP enabled Dom0 or not?

["Fajar A. Nugraha" <fajar@xxxxxxxxx>]

Venefax wrote:
> Dear Mark
> The million dollar question: how? Where is the documentation that can help
> me do that? I mean, tie-up one core Dom0 and simultaneously remove that core
> from the other DumUs
>
>
>   
There is no way to do it simultaneously that I know of.
Here's what I did.
- make sure you disabled hyperthreading (if using Intel) from BIOS.
 hyperthread is not an actual independent core
- in /etc/xen/xend-config.sxp : (dom0-cpus 1)
 this will limit domain0 to use only one cpu
- in /etc/rc.local : xm vcpu-pin 0 0 0
 this will make sure dom0's cpu is on physical cpu 0 (feel free to 
change it to whatever you want). I think "xm vcpu-pin" is broken on RHEL 
5.2's Xen though, so if you use RHEL 5.2 you might want to upgrade 
manually to xen 3.2.
- in every domU's config file : cpus = "^0"
 this will prevent domU from using cpu 0.
- reboot the server
 If you can't reboot the server, you have to rearrange dom0 and domU's 
cpu manually using "xm vcpu-set" and "xm vcpu-pin"
Regards,

Fajar

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