Revisiting Old Friends: Is CoDel Really Achieving What RED Cannot?

Nicolas Kuhn (1, 2) , Olivier Mehani (3) , Emmanuel Lochin (4)

1 RSM - Département Réseaux, Sécurité et Multimédia
2 IRISA - Institut de Recherche en Informatique et Systèmes Aléatoires
3 NICTA - National ICT Australia [Sydney]
4 ISAE-SUPAERO - Institut Supérieur de l'Aéronautique et de l'Espace

We use ns-2 simulations to compare RED's gentle_ mode to CoDel in terms of their ability to reduce the latency for various TCP variants. We use a common dumbbell topol- ogy with Pareto background traffic, and measure the packet delays and transmission time of a 10 MB FTP transfer. In our scenarios, we find that CoDel reduces the latency by 87 %, but RED still manages to reduce it by 75 %. However, the use of CoDel results in a transmission time 42 % longer than when using RED. In light of its maturity, we therefore argue that RED could be considered as a good candidate to tackle Bufferbloat.

Domaines: Réseaux et télécommunications [cs.NI]

Nicolas Kuhn, Olivier Mehani, Emmanuel Lochin. Revisiting Old Friends: Is CoDel Really Achieving What RED Cannot?. CSWS 2014 : ACM SIGCOMM Capacity Sharing Workshop, Aug 2014, Chicago, United States. pp.3-8, ⟨10.1145/2630088.2630094⟩. ⟨hal-01063066⟩