Additional Information
The peer-to-peer transfer caused overflow issues in an MXI thunderbolt configuration due to the host computer PCI power management configuration. In power economy mode, the PCI link with the chassis goes to sleep when there is not enough traffic in the peer to peer transfer. This happens when the bandwidth of the peer to peer transfer is very low, for example when working with very low frequencies. The PCI line has the time to go sleep but not enough time to recover which causes the overflow. Switching the power management in the host computer to max performance solves the issue.