Re: Sane defaults for roaming sensitivity. They still need to be worked on.

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On 12/19/2019 06:20 AM, Pavel Nikulin wrote:
I already tried it with good results. At least, now you don't have
roaming when you are sitting 5 metres away from the AP. Clearly it
works.

Again, roaming with moderately low signal levels (-67-70) is still very jumpy

Can you enable some debugging around where I made changes to see if you can figure out
why it is roaming at the modest signal difference levels?  Maybe my patch can be
improved in that case.

Thanks,
Ben


On Wed, Dec 18, 2019 at 8:42 PM Ben Greear <greearb@xxxxxxxxxxxxxxx> wrote:

On 12/18/19 5:25 AM, Pavel Nikulin wrote:
Hello,

I want to bring to people's attention that there is still an
outstanding issue with roaming logic defaults.

At around -60 to -70 dbi roaming decisions are still taken due to
minute disturbances, and at above -50 dbi they are being taken when
there is no real need to roam.

Current defaults feel to me to be made for non-realistic scenarios.
You may have a lot of APs in range with -60 to -70 signal levels, and
none of them be particularly better than each other. You find this a
lot in office parks.

All of them can have some packet loss, but you will not improve user
experience by having the roaming happen every few minutes in such
cases.

Second to that, a minute disturbance like a person passing in front of
an AP, or something electrically conductive being put near the antenna
may also easily add or subtract few decibels from the signal level
quickly. I think there should be at least some moving average used for
the roaming decision, or better a more advanced filtering method.

Past few patches from Mathew did improve the situation somehow, but I
myself is still having issues with overly aggressive roaming every
day.

Have anybody took a look at this patch
https://www.spinics.net/lists/hostap/msg05792.html ?

Maybe if you test this patch and see good results, it will help it get
upstream?

Thanks,
Ben


--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc  http://www.candelatech.com




--
Ben Greear <greearb@xxxxxxxxxxxxxxx>
Candela Technologies Inc  http://www.candelatech.com


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