摘要
分析FAST TCP在缓存溢出发生时的性能,发现在缓存溢出场景中,收敛中的FAST TCP流经历严重的报文段丢失。相反,已经收敛了的FAST TCP流维持着高吞吐量和低报文段丢失概率。这种不公平是由FAST TCP缩减其窗口时的零传输率导致的。通过修改FAST TCP pacing算法,可以解决此问题。文中提出的α-adjusting算法,通过动态调整FAST TCP协议中的α参数来避免频繁的缓存溢出。通过分析ns2仿真结果,证明该算法在公平性和稳定性方面可获得令人满意的性能。
By analyzing the performance of FAST TCP when buffer overflows occur.We find that,in this case,converging FAST TCP flows suffer from heavy packet losses.In contrast,converged FAST TCP flows maintain high throughput and low packet loss probability.This unfairness results from the zero transmission rate when FAST TCP decreases its congestion window.We tackle this problem by modifying FAST TCP pacing algorithm.Morevoer,we propose an α-adjusting algorithm to avoid frequent buffer overflows by dynamically tuning the α parameter of the FAST TCP protocol.Validated by ns2 simulations,this algorithm demonstrates satisfactory performance in fairness and stability.
出处
《信息通信技术》
2012年第1期60-65,共6页
Information and communications Technologies
