Software latency has often been a problem in gigabit net-working, since it makes the whole communication rather slow even on fast hardware. Previous work, such as BIP, try to solve the problem by sacrifying other aspects such as security. This article presents PAPI, a new software interface aimed at security study on HSL, a gigabit-class network. The basic version shows performance at least equivalent to the best software interfaces available today. Finer analysis shows that hardware is now the limiting factor: software latency is no longer the problem in communications.