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Message-ID: <CA+BoTQ=PWCK6cq83sthqRRt0xYWBOORbb=0+QHM6XVaWCWVhDw@mail.gmail.com> Date: Tue, 22 Mar 2016 07:51:06 +0100 From: Michal Kazior <michal.kazior@...to.com> To: David Lang <david@...g.hm> Cc: linux-wireless <linux-wireless@...r.kernel.org>, Emmanuel Grumbach <emmanuel.grumbach@...el.com>, Network Development <netdev@...r.kernel.org>, "ath10k@...ts.infradead.org" <ath10k@...ts.infradead.org>, codel@...ts.bufferbloat.net, make-wifi-fast@...ts.bufferbloat.net, Johannes Berg <johannes@...solutions.net>, Tim Shepard <shep@...m.mit.edu> Subject: Re: [Make-wifi-fast] [RFCv2 1/3] mac80211: implement fq_codel for software queuing On 22 March 2016 at 02:35, David Lang <david@...g.hm> wrote: > On Wed, 16 Mar 2016, Michal Kazior wrote: > >> Since 11n aggregation become important to get the >> best out of txops. However aggregation inherently >> requires buffering and queuing. Once variable >> medium conditions to different associated stations >> is considered it became apparent that bufferbloat >> can't be simply fought with qdiscs for wireless >> drivers. > > If the network is quiet enough, don't do any buffering, but in almost all > situations you are going to need to buffer starting no later than the second > packet you try to send. > > Don't try to make queueing occur, just deal with the queues that form > naturally because you can't transmit data any faster (and work to keep them > under some semblence of control) [...] This is what already happens. Queues typically start to build up when hardware tx fifos/queues become busy so by the time they become available you might have a bunch of frames you can aggregate. The patch is more about getting rid of qdiscs because it's inherently hard to teach them how 802.11 aggregation works (per-station per-tid) and the ever-changing nature of per-station tx conditions. I'll update the commit log to better reflect what is being done. MichaĆ
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