From: Roman Yeryomin <firstname.lastname@example.org> To: "Valo, Kalle" <email@example.com> Cc: Rajkumar Manoharan <firstname.lastname@example.org>, "email@example.com" <firstname.lastname@example.org>, "email@example.com" <firstname.lastname@example.org>, "Manoharan, Rajkumar" <email@example.com> Subject: Re: ath10k performance, master branch from 20160407 Date: Fri, 22 Apr 2016 20:05:21 +0300 [thread overview] Message-ID: <CACiydbLD2F2Z-iEW_jNr2hoKZzbiA7Y2gCnP4eeKkZpotzkSzA@mail.gmail.com> (raw) In-Reply-To: <firstname.lastname@example.org> On 19 April 2016 at 18:35, Valo, Kalle <email@example.com> wrote: > Michal Kazior <firstname.lastname@example.org> writes: > >> On 19 April 2016 at 09:31, Roman Yeryomin <email@example.com> wrote: >>> On 19 April 2016 at 08:28, Michal Kazior <firstname.lastname@example.org> 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. I would agree with Kalle here. This looks like very serious regression. But I'm afraid I can only help with testing here. Regards, Roman _______________________________________________ ath10k mailing list email@example.com http://lists.infradead.org/mailman/listinfo/ath10k
next prev parent reply other threads:[~2016-04-22 17:05 UTC|newest] Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-04-08 14:44 Roman Yeryomin 2016-04-08 15:34 ` Manoharan, Rajkumar 2016-04-08 16:00 ` Roman Yeryomin 2016-04-08 16:41 ` Manoharan, Rajkumar 2016-04-08 17:19 ` Roman Yeryomin 2016-04-09 4:02 ` Manoharan, Rajkumar 2016-04-13 12:44 ` Roman Yeryomin 2016-04-17 9:28 ` Roman Yeryomin 2016-04-17 15:06 ` Manoharan, Rajkumar 2016-04-17 23:03 ` Roman Yeryomin 2016-04-18 13:00 ` Roman Yeryomin 2016-04-19 5:28 ` Michal Kazior 2016-04-19 7:31 ` Roman Yeryomin 2016-04-19 7:43 ` Michal Kazior 2016-04-19 15:35 ` Valo, Kalle 2016-04-22 17:05 ` Roman Yeryomin [this message] 2016-05-09 12:26 ` Michal Kazior 2016-05-15 22:59 ` Roman Yeryomin 2016-05-16 3:57 ` Rajkumar Manoharan 2016-04-22 17:03 ` Roman Yeryomin 2016-04-22 17:02 ` Roman Yeryomin 2016-04-20 9:03 ` Michal Kazior 2016-04-12 10:16 ` Xue Liu
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