Comment by iyzhang

High-level means not exposing hardware limitations to the application. The primary target applications are datacenter services, which spend much of their time processing network I/O. As network latencies lower to a few microseconds, datacenter applications like Redis will need kernel-bypass because the kernel will become too expensive for them. In our experiments with a 25Gb network, the Linux kernel and POSIX interface costs Redis 60% of its latency.