On Fri, May 21, 2010 at 2:57 PM, Keir Fraser
<keir.fraser@eu.citrix.com> wrote:
On 21/05/2010 04:09, "lei yang" <
yanglei.fage@gmail.com> wrote:
> Hi experts,
>
>
> Q1:What's the different for "dom0_max_vcpus=4 dom0_vcpus_pin" and
> "dom0_max_vcpus=4" ? which will get better performance
dom0_max_vcpus=4 dom0_vcpus_pin will just to core0-3? can it be 3 4 5 6?
if remove "dom0_vcpus_pin" just use " dom0_max_vcpus=4 " can it be 3 4 5 6 ?
It's not really a performance thing, but instead is to mean that some things
like cpufreq management can work directly from dom0. We don't really use the
dom0_vcpus_pin option much.
> Q2: dom0_max_vcpus=4 means "core0-3 will be just used by dom0" or means "4
> cores(not dedicate cores) will be used by dom0, eg: core2-5 or core3-6?
Dom0's VCPUs can be scheduled on any physical CPU at any time, unles
dom0_vcpus_pin is specified.
> Q3.what does mean "nosmp" , xen, dom0,domU, will just use one core????if so,
> can we specify the use different core. eg: dom0=core2 domU=core3? xen will use
> just one core?
It brings Xen up on the boot CPU only. Nothing in the system will use the
other CPUs. You don't want to use this option really.
-- Keir