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From "Cong Wang" <cw...@twopensource.com>
Subject Re: Review Request 31505: (6/6) Add flow classifiers for fq_codel on egress
Date Wed, 04 Mar 2015 20:18:54 GMT

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This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/31505/
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(Updated March 4, 2015, 8:18 p.m.)


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


Changes
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Address review comments


Summary (updated)
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(6/6) Add flow classifiers for fq_codel on egress


Bugs: MESOS-2422
    https://issues.apache.org/jira/browse/MESOS-2422


Repository: mesos


Description
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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)
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  src/slave/containerizer/isolators/network/port_mapping.hpp 8443097 
  src/slave/containerizer/isolators/network/port_mapping.cpp 5227987 

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


Testing
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Manually start two mesos containers with netperf running side.


Thanks,

Cong Wang


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