RE: Slow roaming in mac80211 (2.6.30).

[Johannes Berg <johannes@sipsolutions.net>]

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Lars,

> I have further investigated the roaming issues and found two problems.

Thanks!

> First ieee80211_rx_mgmt_deauth() and ieee80211_rx_mgmt_disassoc()
> sets a retry state at the same time as they tells the wpa_supplicant
> that the AP is gone.
> 
> Patch lae-mac80211-rm-direct-probe.patch addresses this problem.

Hmm. I can see that being a problem, we might get away with just
removing the whole retry block. Ultimately though, I don't think it's a
-stable issue.

> Second problem address the auto scan function in
> ieee80211_sta_config_auth().  When an incomplete AP information is
> found, it start a new scan. This scan will delay the actions taken by
> the wpa_supplicant for the scan period.
> 
> Patch lae-mac80211-rm-extra-scan-request.patch addresses this problem.

I don't think this is correct, it will only work properly with
wpa_supplicant I think. Not really sure though.

> > I would suggest you just use wpa_supplicant -Dnl80211, which 
> > should help
> > a lot with this kind of things.
> 
> I need to patch the kernel for this, rigth ?
> Where can I get appropriate patches?

No, you don't need to patch the kernel, you just need to use a git (?)
version of wpa_supplicant.

johannes

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