The Number of vCPUs Assigned To A Guest Causes VIFs To Go Offline
Article ID: CTX255198
Updated On:
Description
Increasing the number of vCPUs assigned to a VM will reduce the number of available. For instance 10 vCPUs will have 7 active VIFs but 12 vCPUs will only allow 6 active VIFs.
Resolution
Increase the size of the grant table by passing a parameter to xen at boot time. Refer to the following example:
/opt/xensource/libexec/xen-cmdline --set-xen gnttab_max_frames=128
Problem Cause
The number of vCPUs in conjunction with the number of VIFs exhausts the grant table and no more devices will become active.
Issue/Introduction
The number of vCPUs assigned to a guest has a direct correlation to the number of active VIFs that guest can use.
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