Verification

Confirm IOMMU and the huge-pages memory allocation.

1. Enter the following command to verify that the configuration has been successfully updated.

   cat /proc/cmdline

   The output of this command should include the paramters for IOMMU and huge pages.

   An output example:

   BOOT_IMAGE=/boot/vmlinuz-3.10.0-1160.el7.x86_64 root=/dev/sda6 intel_iommu=on default_hugepagesz=1G hugepagesz=1G hugepages=32

2. Confirm that IOMMU is enabled.
   • Enter the following command for AMD-based machines :

     dmesg | grep AMD-Vi

   • Enter the following command for Intel-based machines :

     dmesg | grep -i IOMMU

   If there is no output from one of these commands, you will need to remedy this before moving on.

   • Verify that your hardware supports VT-d and that it has been enabled in the BIOS
   • Verify that the motherboard chipset supports IOMMU
   • Check dmesg for errors suggesting that the BIOS is broken
3. Verify the number of actual allocated huge pages by entering the following command.

   cat /proc/meminfo | grep Huge

   An output example:

   AnonHugePages:    157696 kB
   ShmemHugePages:        0 kB
   HugePages_Total:      32
   HugePages_Free:       32
   HugePages_Rsvd:        0
   HugePages_Surp:        0
   Hugepagesize:    1048576 kB

   Note: By default, memory in a dual-socket system will be allocated from each NUMA node.

   Enter the following command to display the per-node distribution of huge pages.

   cat /sys/devices/system/node/node*/meminfo | grep Huge