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