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mac80211: STA info size

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Hi,

I was just reorganising struct sta_info to clarify the locking (will
send another mail about that) and noticed that due to the HT stuff, each
STA info struct currently (after my reorg) takes 2432 bytes. Almost 2000
of those are in struct sta_ampdu_mlme which is most likely not used for
most STAs.

Do you think that is too much memory per station? It'd probably be
possible to allocate the sta_ampdu_mlme dynamically when needed, no?

johannes

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