Johannes Berg <johannes@xxxxxxxxxxxxxxxx> writes: > On Wed, 2018-09-05 at 14:50 +0200, Toke Høiland-Jørgensen wrote: > > (uh, sorry, bit late ...) > >> > The problem isn't so much how we handle it in mac80211 for the queueing, >> > but how we deal with things like A-MSDU and how we present it to the >> > driver ... for iwlwifi at least we'd really like to have only data >> > frames so we can map it directly to the hardware queue ... >> >> Ah, I see. No, then just putting them at the head of a different TXQ >> probably won't work... >> >> Are you mapping TXQs to hardware queues dynamically as they empty and >> re-fill? Presumably you'll have cases where you don't have enough HWQs? > > Depends on the hardware. Newer hardware has basically unlimited HWQs > (something on the order of 512 IIRC). > > Older hardware sort of maps them dynamically, but not too dynamic, we > also have 32 (ish) queues there. We only free them if we need a new one > and don't have one, and yes, theoretically we can run out and then we > may have to share a single hardware queue for multiple TXQs, but it > basically never happens in practice. Right, gotcha, thanks for the explanation :) -Toke
