Michal Kazior <michal.kaz...@tieto.com> writes: > On 19 April 2016 at 09:31, Roman Yeryomin <leroi.li...@gmail.com> wrote: >> On 19 April 2016 at 08:28, Michal Kazior <michal.kaz...@tieto.com> wrote: >> >>> If my hunch is right there's no easy (and proper) fix for that now. >>> >>> One of the patchset patches (ath10k: implement wake_tx_queue) starts >>> to use mac80211 software queuing. This introduces extra induced >>> latency and I'm guessing it results in fill-in-then-drain sequences in >>> some cases which end up being long enough to make fq_codel_drop more >>> work than normal. >>> >>> This is required for other changes and MU-MIMO performance >>> improvements so this patch can't be removed. >> >> But qca988x doesn't support MU-MIMO, AFAIK. > > Correct. > > >> Can this be made chip dependent? > > I guess it could but it'd arguably make the driver more complex and > harder to maintain. What we want is a long-term fix, not a short-term > one.
But we should never go backwards and TCP dropping from 750 Mbps to ~550 Mbps is a huge drop, so this is not ok. We have to do something to fix this, be it reverting the wake_tx_queue support, somehow disabling it by default or something. -- Kalle Valo _______________________________________________ ath10k mailing list ath10k@lists.infradead.org http://lists.infradead.org/mailman/listinfo/ath10k
