Question How to set IOMMU?  It seems that IOMMU setting doesn't seem to changed based on the VT-d setting in X11DPI-NT. Answer Customer's BIOS is very old.  Informed customer to update the BIOS.  Also BIOS can only enable or disable VT-d.  Customer can check if IOMMU is on or off by dmesg | grep IOMMU in Linux.  IOMMU performance is controlled by CPU and OS. Was this FAQ helpful? YES      NO Enter Comments Below: Note: Your comments/feedback should be limited to this FAQ only. For technical support, please send an email to support@supermicro.com.  Enter your email address below if you'd like technical support staff to reply:  Please type the Captcha (no space) Y X R 8 FAQ Stats FAQ ID Related Category / Keyword Date Posted Code 34572 Feature: - Intel Virtualization Technology (Intel VT) 08/27/21     Print Answer