保障Qos的实时Linux系统设计

For guaranteeing Quality of Service of real-time multimedia task in the integrative business network, a soft real-time Linux system was designed. In this system, the deferring work of receiving interrupt in network shall be executed by work queue, but not the receiving soft-interrupt in network, which is traditional. Work queue is a new kind of bottom halves in Linux 2.6 kernel. It is the most difference from soft-interrupt that deferring work shall be executed in process context. Thus, under the mechanism of process scheduling in Linux 2.6 kernel, the real-time multimedia task and data task shall be scheduled with different priority. This will guarantee the prior handling for real-time multimedia task but not Best Effort and QoS of it. A simple test has been done to certify that the system is stable, and it can guarantee the QoS of real-time multimedia task, especially the delay jitter.