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

Isaac Konikoff konikofi at candelatech.com
Fri Mar 27 15:00:47 EDT 2015

Thanks for pointing out horst.

I've been trying wireshark io graphs such as:
retry comparison:  wlan.fc.retry==0 (line) to wlan.fc.retry==1 (impulse)
beacon delays:  wlan.fc.type_subtype==0x08 AVG frame.time_delta_displayed

I've uploaded my pcap files, netperf-wrapper results and lanforge script 
reports which have some aggregate graphs below all of the pie charts. 
The pcap files with 64sta in the name correspond to the script reports.


I'll upload more once I try the qdisc suggestions and I'll generate 
comparison plots.


On 03/27/2015 10:21 AM, Aaron Wood wrote:
> On Fri, Mar 27, 2015 at 8:08 AM, Richard Smith <smithbone at gmail.com 
> <mailto:smithbone at gmail.com>> wrote:
>     Using horst I've discovered that the major reason our WiFi network
>     sucks is because 90% of the packets are sent at the 6mbit rate. 
>     Most of the rest show up in the 12 and 24mbit zone with a tiny
>     fraction of them using the higher MCS rates.
>     Trying to couple the radiotap info with the packet decryption to
>     discover the sources of those low-bit rate packets is where I've
>     been running into difficulty.  I can see the what but I haven't
>     had much luck on the why.
>     I totally agree with you that tools other than wireshark for
>     analyzing this seem to be non-existent.
> Using the following filter in Wireshark should get you all that 6Mbps 
> traffic:
> radiotap.datarate == 6
> Then it's pretty easy to dig into what those are (by wifi frame-type, 
> at least).  At my network, that's mostly broadcast traffic (AP beacons 
> and whatnot), as the corporate wifi has been set to use that rate as 
> the broadcast rate.
> without capturing the WPA exchange, the contents of the data frames 
> can't be seen, of course.
> -Aaron

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