Re: [Make-wifi-fast] [PATCH] ath10k: Re-enable TXQs for all devices

[Dave Taht <dave.taht@gmail.com>]

On Thu, Nov 9, 2017 at 4:10 PM, Toke Høiland-Jørgensen <toke@toke.dk> wrote:
> Rajkumar Manoharan <rmanohar@qti.qualcomm.com> writes:
>
>>> Commit 4ca1807815aa6801aaced7fdefa9edacc2521767 disables the use of the
>>> mac80211 TXQs for some devices because of a theoretical throughput
>>> regression. We have not seen this regression for a while now, so it should be
>>> safe to re-enable TXQs.
>>>
>>> Signed-off-by: Toke Høiland-Jørgensen <toke@toke.dk>
>>> ---
>>> This has been in LEDE trunk for a couple of months now with good results.
>>>
>> Toke,
>>
>> Good to know that the performance drop is not seen with the chips that does not
>> have push-pull support. The issue was originally reported with ap152 + qca988x
>> by community [1]. Hope this combination is also considered in LEDE.
>
> Ah, was that the original bug report? Thank you, I have not been able to
> find that anywhere!
>
> The issue that seems to point to has been fixed a while ago; I'll send
> and updated patch with a better commit message (also forgot to cc the
> ath10k list, I see).
>
> -Toke

Hmm. I remember that thread. I thought we'd basically resolved that
issue (45% of the time spent in fq_codel_drop under udp flood),
back then, with eric adding the batch drop fix to fq_codel itself:

See commit: https://osdn.net/projects/android-x86/scm/git/kernel/commits/9d18562a227874289fda8ca5d117d8f503f1dcca

which fixed up the problem beautifully:

https://lists.bufferbloat.net/pipermail/make-wifi-fast/2016-May/000590.html

So if we've been carrying this darn patch for the ath10k vs something
that we'd actually fixed elsewhere in the stack, for over a year,
sigh.

-- 

Dave Täht
CEO, TekLibre, LLC
http://www.teklibre.com
Tel: 1-669-226-2619