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Re: [PATCH 4/4] mac80211: reduce the probe response timeout after beacon loss

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On Mon, Nov 22, 2010 at 03:41:23PM +0100, Felix Fietkau wrote:
> On 2010-11-22 7:49 AM, Mohammed Shafi wrote:
> > On Sat, Nov 20, 2010 at 8:09 AM, Felix Fietkau <nbd@xxxxxxxxxxx> wrote:
> >> On 2010-11-19 10:55 PM, Felix Fietkau wrote:
> >>> Waiting for 500 ms after sending a probe request seems a bit excessive,
> >>> especially when doing 5 attempts. If the connection is bad enough to make
> >>> multiple requests time out, then user space should try to quickly find a
> >>> new AP.
> > This might improve fail over roaming to a small extent but  as per the
> > commit id d1c5091f23fed5195271e2849f89017d3a126521 it was mentioned
> > this might affect robustness against 'slow AP's'
> > 
> >> Hmm, don't merge this patch yet, it can cause background scans to
> >> trigger reconnects.
> >>
> > I am not sure  how this affects background scan.bgscan will be enabled
> > even before the beacon loss and it is based on RSSI(please correct me
> > if I am wrong).
> I'm not sure either, this showed up in my tests. I'm pretty sure that
> this change is not the root cause, but I don't want to see it merged
> until the cause is figured out. My guess is that it's related to the
> issues with the nullfunc probe request patch that Paul pointed out.
> I'll do some more testing after I've fixed that one.

I'm dropping this from my queue -- please repost if you decide it
is warranted.

John
-- 
John W. Linville		Someday the world will need a hero, and you
linville@xxxxxxxxxxxxx			might be all we have.  Be ready.
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