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Re: Aggregation problem with rt2800 AP and Intel 5100 STA

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On Thu, 2011-03-24 at 14:09 +0100, Helmut Schaa wrote:

> Ok, found out some more. The problem now seems to trigger only if the Intel STA
> leaves powersave and mac80211 dropped a frame while the STA was sleeping (either
> due to the size of the STA PS buffer or due to a race between rx/tx processing).

Why do we even have aggregation sessions active while the station goes
to sleep? Is it scanning?

Maybe the PS buffer should be larger then? I don't see how we can lose a
frame due to rx/tx processing races either, how does that happen? I
thought we had the ability to avoid all those races now.

> This can also cause a sequence number hole in the STAs rx reordering buffer but
> we won't send a BAR in that case ending in the same situation that the Intel STA
> BlockAcks AMPDUs to it but doesn't pass them to the user space.
> 
> Johannes, does it make sense to always send a BAR when a STA wakes up from
> sleep and we've got an active aggregation session?

I don't know, you tell me, does it? :)

joahnnes

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