為了在綜合業(yè)務(wù)網(wǎng)絡(luò)中保障實時多媒體業(yè)務(wù)的服務(wù)質(zhì)量(QoS),設(shè)計了軟實時Linux 系
統(tǒng)。系統(tǒng)中將網(wǎng)絡(luò)接受中斷的推后執(zhí)行工作校由工作隊列來執(zhí)行，而非傳統(tǒng)的由網(wǎng)絡(luò)接受軟中斷處理。工作隊列是Linux 2.6 內(nèi)核的進程調(diào)度機制，對實時多媒體任務(wù)和數(shù)據(jù)任務(wù)實施不同的優(yōu)先級調(diào)度，以保證實時多媒體任務(wù)的優(yōu)先處理而不是盡力而為（Best Effort），保障其服務(wù)質(zhì)量。通過簡單的測試證明本系統(tǒng)運行穩(wěn)定，能夠保障實時多媒體業(yè)務(wù)的服務(wù)質(zhì)量，尤其對解決延遲抖動問題有明顯的效果。關(guān)鍵詞:實時;服務(wù)質(zhì)量;內(nèi)核;工作隊列
Abstract: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 eceiving interrupt in network shall be executed by work queue,but not the receiving soft-interrupt n network,which is traditional.Work queue is a new kind of bottom halves in Linux 2.6 kernel.It s the most difference from soft-interrupt that deferring work shall be executed in process ontext.Thus,under the mechanism of process scheduling in Linux 2.6 kernel,the real-time ultimedia task and data task shall be scheduled with different priority.This will guarantee the rior handling for real-time multimedia task but not Best Effort and QoS of it.A simple test has een done to certify that the system is stable,and it can guarantee the QoS of real-time multimedia ask,especially the delay jitter.
Key words:real-time,QoS,kernel,work queue