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(Updated May 15, 2015, 9:32 p.m.)

Review request for mesos, Chi Zhang, Ian Downes, and Jie Yu.


Address review comments from Jie

Bugs: MESOS-2422

Repository: mesos


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 (updated)


Diff: https://reviews.apache.org/r/31505/diff/


Manually start two mesos containers with netperf running side.


Cong Wang

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