What is vt d feature

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Now live: A fully responsive profile. Related 2. Hot Network Questions. Question feed. Accept all cookies Customize settings. I assume that's what is meant. I could not find actual data points in hand for performance using these technologies. As its dependent on the Hypervisor, not strictly the hardware. Public information is available from VMware, Citrix, etc. The hypervisor used and the workload used will have a BIG impact on the overall platform performance so your mileage will vary. Sharing data across containers is typically not allowed.

VT-d: also known as IOMMU : supports the sharing of singular physical resources such as disk drives, network devices, etc in a computer. VT-d also offers memory protections, preventing certain malware from changing memory attributes such as read, write and execute.

Virtual machines are dynamic things and change constantly. In the case of storage, there may be many partitions and many owners of a particular partition. Think Google cloud — many clients. Imagine engineering sharing a VM and partition with finance.

There may be regulatory restrictions as well. This has to do with the specific hypervisor solution being used. In a type 1 or bare metal hypervisor, VT-d in hardware actually manages the resources instead of the SW hypervisor, leaving the CPU to perform more critical tasks.

Secure DMA is used to communicate and transfer data between endpoints very effectively. As a result, overall impact to the platform in terms of performance and power is much reduced.

Performance is so much better that Microsoft decided to architect their latest operating systems around virtualization. They recently published an article speaking to the merits of VT-d. To continue this discussion, please ask a new question. I found that they were both disabled. Is there any harm in enabling them? Improve this question. Hennes Add a comment. Active Oldest Votes. Improve this answer. Anand Anand 1, 2 2 gold badges 16 16 silver badges 24 24 bronze badges. Jeff Atwood Ed Bishop Ed Bishop 2 2 silver badges 4 4 bronze badges.

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