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Review request for mesos, Chi Zhang, Ian Downes, and Jie Yu. Repository: mesos Description ------- Currently we do nothing on the host egress side. By default, kernel uses its own hash function to classify the packets to different TX queues (if the hardware interface supports multiqueue). So packets coming out of different containers could end up queueing in the same TX queue, in this case we saw buffer bloat on some TX queue caused packet drops. We need to isolation the egress traffic so that containers will not have interference with each other. The number of hardware TX queues is limited by hardware interface, usually not enough to map our container in 1:1 way, therefore we need some software solution. We choose fq_codel and use tc filters to classify packets coming out of different containers to different fq_codel flows, and the codel algorithm on each flow could also help us to reduce the buffer bloat. Note when the packets leave fq_codel, they still share the physical TX queue(s), this is however (almost) beyond what we can control, we have to rely on the kernel behavior. TODO: get some performance numbers Diffs ----- src/slave/containerizer/isolators/network/port_mapping.hpp 8443097b2c79fef5ae0e23a3fb815ffec0318a93 src/slave/containerizer/isolators/network/port_mapping.cpp 5227987cdb7b904c2f4bb2bdf5c5d705a435010d Diff: https://reviews.apache.org/r/31505/diff/ Testing ------- Manually start two mesos containers with netperf running side. Thanks, Cong Wang
