[Xen-users] Re: [Xen-devel] What's the different for "dom0_max_vcpus=4 dom0_vcpus_pin" and "dom0_max_vcpus=4" ?

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 21/05/2010 16:55, "Pasi Kärkkäinen" <pasik@xxxxxx> wrote:

>>    if I don't use "xm vcpu-pin" does it will use core 0 1 2 3 by default not
>>    can use 3 4 5 6?
>> 
> 
> Yes, it'll use 0 1 2 3 as a default. It cannot be changed, unless you do
> custom pinning after the system has started.

It will only stick to 0 1 2 3 if you specify dom0_vcpus_pin on the Xen
command line. And if you do that, then the pinning canno tbe changed by
xm/xl vcpu-pin.

If you do not specify dom0_vcpus_pin then dom0 VCPUs will execute on
arbitrary physical CPUs until you restrict each VCPU's affinity using xm/xl
vcpu-pin.

By default, any VCPU (whether dom0's or a domU's) can be executed at any
time on any physical CPU. If there are CPUs you specifically want to
restrict a given VCPU or domain to, then you have to get busy with xm/xl
vcpu-pin.

Anyway, I think that is this particular horse flogged to death. No more on
xen-devel please.

 K.



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