TY - GEN
T1 - The dynamic nature of Congestion inInfiniBand
AU - Liu, Qian
AU - Russell, Robert D.
AU - Mizero, Fabrice
AU - Veeraraghavan, Malathi
AU - Dennis, John M.
AU - Jamroz, Benjamin
N1 - Publisher Copyright:
© 2015 IEEE.
PY - 2015/12/2
Y1 - 2015/12/2
N2 - The InfiniBand Congestion Control (CC) mechanism is able to reduce congestion and improve performance in many situations. In this paper we study the characteristics of congestion in InfiniBand by monitoring and analyzing the CC mechanism with a hardware analyzer. To the best of our knowledge, this is the first paper that presents experience with, and analysis of, the InfiniBand CC with such a tool. We found that there can be more than one root of congestion, as defined by the IBTA specification, existing at the same time in the congestion tree, and a root of congestion can be converted to a victim of congestion as its nature changes. We also observed that even with constant traffic flows, the root of congestion will shift from one place to another within the congestion tree, with corresponding consequence for packets from various traffic sources: traffic that might be negatively impacted by tree spreading and might be not contributing to the root of congestion before, will be treated as a congestion contributor and then be throttled by the CC mechanism.
AB - The InfiniBand Congestion Control (CC) mechanism is able to reduce congestion and improve performance in many situations. In this paper we study the characteristics of congestion in InfiniBand by monitoring and analyzing the CC mechanism with a hardware analyzer. To the best of our knowledge, this is the first paper that presents experience with, and analysis of, the InfiniBand CC with such a tool. We found that there can be more than one root of congestion, as defined by the IBTA specification, existing at the same time in the congestion tree, and a root of congestion can be converted to a victim of congestion as its nature changes. We also observed that even with constant traffic flows, the root of congestion will shift from one place to another within the congestion tree, with corresponding consequence for packets from various traffic sources: traffic that might be negatively impacted by tree spreading and might be not contributing to the root of congestion before, will be treated as a congestion contributor and then be throttled by the CC mechanism.
KW - Congestion Control
KW - Congestion Tree
KW - InfiniBand
KW - Root of Congestion
KW - Victim of Congestion
UR - https://www.scopus.com/pages/publications/84960843476
U2 - 10.1109/IEMCON.2015.7344436
DO - 10.1109/IEMCON.2015.7344436
M3 - Conference contribution
AN - SCOPUS:84960843476
T3 - 2015 International Conference and Workshop on Computing and Communication, IEMCON 2015
BT - 2015 International Conference and Workshop on Computing and Communication, IEMCON 2015
A2 - Chakrabarti, Satyajit
A2 - Saha, Himadri Nath
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - International Conference and Workshop on Computing and Communication, IEMCON 2015
Y2 - 15 October 2015 through 17 October 2015
ER -