I/o cache partitioning

A method comprising:

• receiving a request from an I/O device to identify a memory location for data from a virtual address in the request;
• identifying, from the request, that the memory location is located in a dedicated I/O cache for I/O transactions, wherein the dedicated cache comprises one or more partitions;
• determining that the request corresponds to a first one of the one or more partitions;
• and
• returning an address of the I/O cache as a response to the request.

A system comprising:

• a first device;
• and
• a second device coupled to the first device by an interconnect, the second device comprising:
• one or more processor cores;
• a last-level cache for use by the one or more processor cores;
• an I/O subsystem to transfer data on the interconnect;
• an I/O last-level cache for use by the I/O subsystem in the transfer of data on the interconnect, wherein the I/O last-level cache is separate from the last-level cache;
• and
• a management engine to manage partitions in the I/O last level cache.