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: >> On 18 April 2016 at 15:00, Roman Yeryomin <leroi.li...@gmail.com> wrote: >>> So it looks like Michal's patch set "ath10k: implement push-pull tx >>> model" introduced this regression - after restoring it from reverts >>> fq_codel_drop is hungry again. >>> Any ideas how to fix? >> >> 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. The long-term fix is a work-in-progress which aims at killing bufferbloat in general . This should, by proxy, improve everything. : https://www.spinics.net/lists/linux-wireless/msg149776.html : https://www.spinics.net/lists/linux-wireless/msg148714.html : https://www.spinics.net/lists/linux-wireless/msg149039.html You can try out patchset from  (and maybe  as well) to see if it helps you (assuming you have spare time to play around). Michał _______________________________________________ ath10k mailing list firstname.lastname@example.org http://lists.infradead.org/mailman/listinfo/ath10k