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Parameter Name Description Type
VCPUs-params configuration parameters for
the selected VCPU policy.
You can tune a VCPU's pinning
with
xe vm-param-set \
uuid=<vm_uuid> \
VCPUs-params:mask=1,2,3
The selected VM will then run
on physical CPUs 1, 2, and 3
only.
You can also tune the VCPU
priority (xen scheduling) with
the cap and weight parameters;
for example
xe vm-param-set \
uuid=<vm_uuid> \
VCPUs-params:weight=512
xe vm-param-set \
uuid=<vm_uuid> \
VCPUs-params:cap=100
A VM with a weight of 512 will
get twice as much CPU as a
domain with a weight of 256
on a contended XenServer host.
Legal weights range from 1 to
65535 and the default is 256.
The cap optionally fixes the
maximum amount of CPU a VM
will be able to consume, even if
the XenServer host has idle CPU
cycles. The cap is expressed in
percentage of one physical CPU:
100 is 1 physical CPU, 50 is half
a CPU, 400 is 4 CPUs, etc. The
default, 0, means there is no
upper cap.
read/write map parameter
VCPUs-max maximum number of virtual
CPUs.
read/write
VCPUs-at-startup boot number of virtual CPUs read/write