[Cerowrt-devel] [Bloat] capturing packets and applying qdiscs
david at lang.hm
Fri Mar 27 15:23:56 EDT 2015
I gathered a bunch of stats from the Scale conference this year
this includes very frequent dumps of transmission speed data per MAC address per
On Fri, 27 Mar 2015, Isaac Konikoff wrote:
> 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
>> 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.
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