{"title":"调度延迟关键流量:DRR+和DRR++的测量研究","authors":"C. Zhang, M. MacGregor","doi":"10.1109/HPSR.2002.1024247","DOIUrl":null,"url":null,"abstract":"Efficient fair queuing using deficit round-robin, DRR, proposed by Shreedhar and Varghese (1996) is a low-complexity packet scheduler that has several commercial implementations. DRR has also been extended as DRR+ to accommodate latency-critical flows. DRR+, however, assumes that a latency-critical flow exhibits very smooth arrivals whereas most network flows are very bursty in nature, either as the result of source bursts, or as a result of the dynamics of multihop network paths. When DRR+ encounters a burst, it reverts back to the behavior of DRR, providing no preference or latency bound for latency critical traffic. This is a fatal flaw that prevents DRR+ from being useful in scheduling bursty latency-critical flows. We present a different extension to DRR that has much lower delay and delay jitter than DRR+ and is capable of handling bursty latency-critical flows.","PeriodicalId":180090,"journal":{"name":"Workshop on High Performance Switching and Routing, Merging Optical and IP Technologie","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2002-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"6","resultStr":"{\"title\":\"Scheduling latency-critical traffic: a measurement study of DRR+ and DRR++\",\"authors\":\"C. Zhang, M. MacGregor\",\"doi\":\"10.1109/HPSR.2002.1024247\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Efficient fair queuing using deficit round-robin, DRR, proposed by Shreedhar and Varghese (1996) is a low-complexity packet scheduler that has several commercial implementations. DRR has also been extended as DRR+ to accommodate latency-critical flows. DRR+, however, assumes that a latency-critical flow exhibits very smooth arrivals whereas most network flows are very bursty in nature, either as the result of source bursts, or as a result of the dynamics of multihop network paths. When DRR+ encounters a burst, it reverts back to the behavior of DRR, providing no preference or latency bound for latency critical traffic. This is a fatal flaw that prevents DRR+ from being useful in scheduling bursty latency-critical flows. We present a different extension to DRR that has much lower delay and delay jitter than DRR+ and is capable of handling bursty latency-critical flows.\",\"PeriodicalId\":180090,\"journal\":{\"name\":\"Workshop on High Performance Switching and Routing, Merging Optical and IP Technologie\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2002-11-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"6\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Workshop on High Performance Switching and Routing, Merging Optical and IP Technologie\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1109/HPSR.2002.1024247\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Workshop on High Performance Switching and Routing, Merging Optical and IP Technologie","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/HPSR.2002.1024247","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Scheduling latency-critical traffic: a measurement study of DRR+ and DRR++
Efficient fair queuing using deficit round-robin, DRR, proposed by Shreedhar and Varghese (1996) is a low-complexity packet scheduler that has several commercial implementations. DRR has also been extended as DRR+ to accommodate latency-critical flows. DRR+, however, assumes that a latency-critical flow exhibits very smooth arrivals whereas most network flows are very bursty in nature, either as the result of source bursts, or as a result of the dynamics of multihop network paths. When DRR+ encounters a burst, it reverts back to the behavior of DRR, providing no preference or latency bound for latency critical traffic. This is a fatal flaw that prevents DRR+ from being useful in scheduling bursty latency-critical flows. We present a different extension to DRR that has much lower delay and delay jitter than DRR+ and is capable of handling bursty latency-critical flows.