Intel VT-d (IOMMU) support on poweredge servers

Tim Small tim at seoss.co.uk
Fri Jul 23 05:10:20 CDT 2010


Stewart St. Dennis wrote:
> Tim:
> I had to wander down this lane recently.  It is a two step process:
>  1. From the computer specs., determine the specific Intel chip
> present in the PE1950
>  2. From the the Intel® Virtualization Technology List
> <http://ark.intel.com/VTList.aspx> , see what that chip can do.

Thanks for this, but there are two other pieces to the puzzle - second
the motherboard chipset has to support it (although this is not an issue
for "Core 3" generation chips as used in 11G poweredges - only the CPU
needs support), and thirdly the BIOS has to enable the feature.  e.g. I
have a Dell here with all the necessary components for VT-d support, but
Dell haven't bothered to turn on the IOMMU in the BIOS (or give the
option to do so).  For the poweredges, there are no details in the Dell
datasheets or manuals either (including machines which definitely do
have this functionality - like the R410).

Same deal for AHCI on the R200, R300 etc. all the components are there,
but you have to (currently) patch the kernel to force AHCI mode on...

Cheers,

Tim.

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