Logical Domain capable servers can soon assign devices on a slot granularity to LDOMS. Previously only whole PCI-busses could be assigned to domains. This will provide more freedom and better performance for virtualized environments using logical domains. A LDOM could with this enhancement have direct access to it's own NIC and HBA for better performance. It could also make smaller configurations less complex since no virtual disk servers and or virtual networks switches would be needed in an I/O domain. This features has integrated in b133 and will be part of the OpenSolaris 2010.03 release.
"This is an RFE filed to Static Direct I/O feature support in Solaris.
This project enables PCI express devices to be assigned directly to logical domains at the slot level. The assignments are "static" in the sense that any changes to the disposition of devices requires a reboot of the root domain to take effect."
LDoms static Direct I/O support (6848789)
Talks I have given
3 months ago