[ale] WIFI mystery speed problems

[James Sumners]

And something else I found out recently: not all 802.11n devices will
participate in 80MHz communications. It seems to be hit or miss. My cheapo
Netgear USB dongles work just fine, but my Roku stick is having none of it.

On Tuesday, February 23, 2016, Alex Carver <agcarver+ale at acarver.net> wrote:

> On 2016-02-23 05:37, Steve Tynor wrote:
> > An update and preliminary declaration of victory.
> >
> > In one of many random config changes (mostly trying to change channels),
> > I changed the "channel width" from 40 Mhz to 20 Mhz. Since making that
> > change, the network has been rock solid - no silly slowdowns.   As I
> > understand it, the 40Mhz setting was supposed to improve bandwidth but I
> > never measured any improvement -- and in fact, turning it back down to
> > 20 Mhz seems to have solved my periodic slowdown problem.
> >
> > Thanks again for all the help and advice,
> > Steve
> >
> > On 2/18/16 12:31 PM, Steve Tynor wrote:
> >> I'm looking for some brainstoming ideas to explain why my home wifi
> >> router's performance is suddenly acting so strange: periodically
> >> (about once a day), performance (as tested by speedtest.net)
> >> drastically decreases from ~30Mb/s to ~4Mb/s.
> >>
> >> When this happens, there's nothing I can do to make it better.
> >> Rebooting the router has no effect.  The speed comes back when its
> >> good and ready - not before.  These "outages" usually last about 12
> >> hours.  Performance is bad from all clients - macbook, ubuntu laptop,
> >> phones - so this seems to be router specific - not due to client config.
> > ...
>
>
> That probably means the front-end radio couldn't handle the bandwidth.
> I'm sure the power envelope was not ideal (significant roll-off, spurs,
> etc.) so narrowing your bandwidth would put you in the radio's sweet
> spot of operation.
>
> The radio in consumer routers (and a few commercial APs) is built for
> profit not performance.
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-- 
James Sumners
http://james.sumners.info/ (technical profile)
http://jrfom.com/ (personal site)
http://haplo.bandcamp.com/ (band page)
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