[PATCH] FT: Add FT over-the-DS selection for SME based drivers

Dennis Bland dennis at dbperformance.com
Sat Apr 13 10:11:54 PDT 2019


That's a good question.  In our testing, we see a larger performance
variation with FT over-the-DS (as it is more dependent on the
underlying wired infrastructure), than with FT over-the-air.  This
often results in FT over-the-DS having a slower average roam time than
FT over-the-air.  However, FT over-the-DS can be faster than FT
over-the-air with a well-designed wired infrastructure or when RF
congestion is a problem, as the authentication frames do not need to
be transmitted over-the-air.

On Sat, Apr 13, 2019 at 10:26 AM Jouni Malinen <j at w1.fi> wrote:
>
> On Sat, Apr 13, 2019 at 09:24:47AM -0600, Dennis Bland wrote:
> > Some implementations (e.g. mobile IoT Wi-Fi) prefer FT over-the-DS for
> > the reasons you mentioned above, if the AP advertises support for it.
> > Is there another way for wpa_supplicant to autonomously select FT
> > over-the-DS, if supported by the AP?
>
> My main question on this patch is whether that should indeed be done by
> default instead of adding this configuration parameter to do that
> conditionally. Over-the-DS case is not currently used unless explicitly
> requested for a particular roam, but if there is agreement on it being
> better for all cases, it should be used by default if supported by the
> AP.
>
> --
> Jouni Malinen                                            PGP id EFC895FA



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