Centos6.8 enables transparent transmission
2.1.1 in grub.conf
Add intel_iommu=on on the kernel line of
# vim / boot/efi/EFI/redhat/grub.conf or / boot/grub/grub.conf
Kernel/vmlinuz-2.6.32-262.el6.x86_64 ro root=UUID=5abe1186-9917-41ec-b057-641f08b0eba5 5rd_NO_LUKS rd_NO_LVM LANG=en_US.UTF-8 rd_NO_MD SYSFONT=latarcyrheb-sun16 crashkernel=128M KEYBOARDTYPE=pc KEYTABLE=us rd_NO_DM rhgb quiet intel_iommu=on
2.1.2 restart the system # reboot
Don't do the rest.
