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How to disable interrupt remapping

How to disable interrupt remapping (C series Server) and ESX

Interrupt Remapping is disabled by default in 1.4(3) code and greater.

To disable Interrupt remapping via CIMC:

http://www.laliamos.com/yfiles/?di=4133910153816

To disable interrupt remapping on ESXi, perform one of these options:

To set the interrupt mapping via esxcli:


ESXi 5.0 does not provide this parameter as a GUI client configurable option. It can only be changed via esxcli or PowerCLI.


List the present setting:

# esxcli system settings kernel list -o iovDisableIR

The output is similar to:

Name          Type  Description                              Configured  Runtime  Default

------------  ----  ---------------------------------------  ----------  -------  -------

iovDisableIR  Bool  Disable Interrrupt Routing in the IOMMU  FALSE        FALSE    FALSE

Disable interrupt mapping on the host with this command:

# esxcli system settings kernel set --setting=iovDisableIR -v TRUE

Reboot the host after running the command.

To check if interrupt mapping is set after the reboot, run the command

# esxcfg-info –c

iovDisabledIR = TRUE

In vSphere Client:


ESXi 5.0

  • Click Configuration > (Software) Advanced Settings > VMKernel.
  • Select VMKernel.Boot.iovDisableIR and click OK
  • Reboot the ESX host.

http://www.laliamos.com/yfiles/?di=5133910153812

References:


VMWARE-KB-1030265

CSCtw68712

Comments
Cisco Employee

Excellent information!

Community Member

In a B Series chassis with numerous ESXi hosts - do I have to disable interrupt remapping on each host?

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