You can now configure the size of the transmit descriptor ring on the X4 Express
datapath ('CTPIO'). The EF_TXQ_SIZE and EF_RXQ_SIZE per-interface configuration options have been updated to
accept a value of -1, indicating to use an architecture-appropriate
default size. As a result, you can now allocate up to 256 VIs with TXQs on the X4
Express datapath, instead of the previous maximum of 128.