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From: "Valo, Kalle" <kvalo@qca.qualcomm.com>
To: "michal.kazior@tieto.com" <michal.kazior@tieto.com>
Cc: Roman Yeryomin <leroi.lists@gmail.com>,
	"Manoharan, Rajkumar" <rmanohar@qti.qualcomm.com>,
	"ath10k@lists.infradead.org" <ath10k@lists.infradead.org>,
	Rajkumar Manoharan <rmanohar@codeaurora.org>
Subject: Re: ath10k performance, master branch from 20160407
Date: Tue, 19 Apr 2016 15:35:16 +0000	[thread overview]
Message-ID: <87k2jtk3wt.fsf@kamboji.qca.qualcomm.com> (raw)
In-Reply-To: <CA+BoTQmn_hS1X1BjC7=wmevnAGiPx7iit0NMUxnmmqjFZ_RnVA@mail.gmail.com>	(Michal Kazior's message of "Tue, 19 Apr 2016 09:43:31 +0200")

Michal Kazior <michal.kazior@tieto.com> writes:

> On 19 April 2016 at 09:31, Roman Yeryomin <leroi.lists@gmail.com> wrote:
>> On 19 April 2016 at 08:28, Michal Kazior <michal.kazior@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

  reply	other threads:[~2016-04-19 15:35 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 [this message]
2016-04-22 17:05                           ` Roman Yeryomin
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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