#697: roaming between two ap with r1593
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Reporter: anonymous | Owner:
Type: defect | Status: new
Priority: minor | Milestone:
Component: madwifi: other | Version: trunk
Resolution: | Keywords: minRssi
Patch_attached: 0 |
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Comment (by ted bullgam):
Hi,
Roaming is quite slow with the default drivers because the cache ages to
slowly (~15 s until old AP dissapears!).
Imagine a moving machine using a madwifi station. The machine is
travelling from one AP to another while you are transferring data with
maximum bandwidth (we always need the best results we can get, we want to
be perfect, eh?). So it would be best to have a look at the signals of the
current assoc, if the signal drops below a threshold it is still soon
enough to look for a better AP but stay connected to the old AP. Now we
planned the infrastructure to give a better AP at this point. The current
driver will stay connected to the old AP resulting in a VERY poor
throughput although it would be obviously better to use the AP we are next
to.
So a few things to do:
* make the timer self contained for aging the cache
* make the timer adjustable
* start scanning even if data is transmitted continuosly (yes, i call
this a bug), only get back to the assoc and process for a while and
continue scanning afterwards.
* add a threshold RSSI that starts to look for a new AP if the signal is
not perfect but still sufficent.
* plan to use enough APs for moving WLAN connected machines
Currently it is impossible to have moving machines with madwifi cards
because the signals has to get so bad that no data can be transfered
anymore. Only now the scan request does not get interrupted and it can
look for new APs. This scan takes ages if you do not limit channels
(athchans is your friend). The current madwifi will drop the signal for at
least 1-5 seconds, and with these times you can call yourself lucky, often
it is even worse :-(
I would be happy if someone likes to fix this. I am to stupid for those
things and so i am using two radios and switch routes between them.
--
Ticket URL: <http://madwifi.org/ticket/697>
MadWifi <http://madwifi.org/>
Multiband Atheros Driver for Wireless Fidelity
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