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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 Fri, 06 Mar 2015 00:26:06 GMT


> On March 5, 2015, 1:36 a.m., Chi Zhang wrote:
> > src/slave/containerizer/isolators/network/port_mapping.hpp, line 195
> > <https://reviews.apache.org/r/31505/diff/2/?file=884516#file884516line195>
> >
> >     I think we probably want to rename other counter names to account for both ingress
and egree qdiscs, but that's probably another patch.

Feel free to open a ticket for yourself if you think this is necessary.


- Cong


-----------------------------------------------------------
This is an automatically generated e-mail. To reply, visit:
https://reviews.apache.org/r/31505/#review75271
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On March 4, 2015, 8:18 p.m., Cong Wang wrote:
> 
> -----------------------------------------------------------
> This is an automatically generated e-mail. To reply, visit:
> https://reviews.apache.org/r/31505/
> -----------------------------------------------------------
> 
> (Updated March 4, 2015, 8:18 p.m.)
> 
> 
> Review request for mesos, Chi Zhang, Ian Downes, and Jie Yu.
> 
> 
> Bugs: MESOS-2422
>     https://issues.apache.org/jira/browse/MESOS-2422
> 
> 
> 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 8443097 
>   src/slave/containerizer/isolators/network/port_mapping.cpp 5227987 
> 
> Diff: https://reviews.apache.org/r/31505/diff/
> 
> 
> Testing
> -------
> 
> Manually start two mesos containers with netperf running side.
> 
> 
> Thanks,
> 
> Cong Wang
> 
>


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