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From: Roman Yeryomin <leroi.lists@gmail.com>
To: "Valo, Kalle" <kvalo@qca.qualcomm.com>
Cc: Rajkumar Manoharan <rmanohar@codeaurora.org>,
	"michal.kazior@tieto.com" <michal.kazior@tieto.com>,
	"ath10k@lists.infradead.org" <ath10k@lists.infradead.org>,
	"Manoharan, Rajkumar" <rmanohar@qti.qualcomm.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: <87k2jtk3wt.fsf@kamboji.qca.qualcomm.com>

On 19 April 2016 at 18:35, Valo, Kalle <kvalo@qca.qualcomm.com> wrote:
> 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.

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

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  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 ath10k performance, master branch from 20160407 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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