The X2 series adapter supports up to 2048 VIs, and all VIs can transmit using CTPIO. However, only one CTPIO packet, per adapter physical port, can be pushed at a time. When multiple VIs are mapped to the same physical port, a CTPIO push in progress will continue undisturbed, whilst another push attempt, overlapping the first, will fail with the send falling back to use the normal DMA transmit datapath.
The adapter can tolerate back-to-back bursts of CTPIO frames from a VI. An Onload stack creates a VI for each physical port that it uses.
Note: X2 series adapters support CTPIO on
a maximum four physical ports.