[Cerowrt-devel] [Bloat] capturing packets and applying qdiscs

David Lang david at lang.hm
Thu Mar 26 20:39:23 EDT 2015

On Thu, 26 Mar 2015, Isaac Konikoff wrote:

> Hi All,
> Looking for some feedback in my test setup...
> Can you please review my setup and let me know how to improve my application 
> of the qdiscs? I've been applying manually, but I'm not sure that is the best 
> method, or if the values really make sense. Sorry if this has been covered ad 
> nauseum in codel or bloat threads over the past 4+ years...
> I've been capturing packets on a dedicated monitor box using the following 
> method:
> tshark -i moni1 -w <file>
> where moni1 is ath9k on channel 149 (5745 MHz), width: 40 MHz, center1: 5755 
> MHz
> The system under test is a lanforge ath10k ap being driven by another 
> lanforge system using ath9k clients to associate and run traffic tests.
> The two traffic tests I'm running are:
> 1. netperf-wrapper batch consisting of:  tcp_download, tcp_upload, 
> tcp_bidirectional, rrul, rrul_be and rtt_fair4be on 4 sta's.
> 2. lanforge wifi capacity test using tcp-download incrementing 4 sta's per 
> minute up to 64 sta's with each iteration attempting 500Mbps download per x 
> number of sta's.

what results are you getting? and what results are you hoping to get to?

David Lang

> The qdiscs I am using are applied to the virtual ap interface which is the 
> egress interface for download tests. I also applied the same qdisc to the 
> ap's eth1 for the few upload tests. Is this sane?
> qdiscs used, deleting each before trying the next:
> 1. default pfifo_fast
> 2. tc qdisc add dev vap1 root fq_codel
> 3. tc qdisc add dev vap1 root fq_codel target 5ms interval 100ms noecn
> 4. tc qdisc add dev vap1 root fq_codel limit 2000 target 3ms interval 40ms 
> noecn
> Any suggestions you have would be helpful.
> Thanks,
> Isaac
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