Switchless interconnect fabric message distribution includes end-to-end partitioning of message pathways or multiple priority levels with interrupt capability. A switchless interconnect fabric message distribution system includes a data distribution module and at least two host-bus adapters connected to the data distribution module. The data distribution module includes partition first in first out buffers. Each of the host-bus adapters includes an input manager connected to input priority first in first out buffers and an output manager connected to priority first in first out buffers.