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From: moeller0 <moeller0@gmx.de>
To: "Toke Høiland-Jørgensen" <toke@toke.dk>
Cc: Loganaden Velvindron <loganaden@gmail.com>,
	make-wifi-fast@lists.bufferbloat.net
Subject: Re: [Make-wifi-fast] crypto-fq bug postmortem is up
Date: Mon, 19 Sep 2016 13:36:07 +0200	[thread overview]
Message-ID: <DC1A6D4B-7301-44F8-905D-A6615E769BFC@gmx.de> (raw)
In-Reply-To: <8760psgmdm.fsf@toke.dk>

Hi Toke,

> On Sep 19, 2016, at 13:27 , Toke Høiland-Jørgensen <toke@toke.dk> wrote:
> 
> moeller0 <moeller0@gmx.de> writes:
> 
>> Hi Loganaden, hi Toke,
>> 
>>> On Sep 19, 2016, at 05:56 , Loganaden Velvindron <loganaden@gmail.com> wrote:
>>> 
>>> On Mon, Sep 19, 2016 at 12:50 AM, Sebastian Moeller <moeller0@gmx.de> wrote:
>>>> 
>>>> Hi Loganaden,
>>>> 
>>>> this sounds somewhat familiar to me (see
>>>> https://bugs.lede-project.org/index.php?do=details&task_id=176 ). At least
>>>> the symptoms are similar and so is the temporary remedy (calling wifi on the
>>>> CLI). Are you using LEDE firmwares as well? In my case it seems bad radio
>>>> conditions help expose the issue somewhat easier... My current idea is that
>>>> r1482 (commit    372d0fea29e60b02154fd7176ba32e7742f6640e, ' ath9k: add a
>>>> bunch of powersave handling fixes') somehow introduced a new or exposed an
>>>> old and hidden bug for the atheros radios, r1483 (commit
>>>> a894a535ff7e6c37bd853e951663130482bc0ff2, 'mac80211: add fixes for dealing
>>>> with unexpected BlockAck frames') might either have introduced an easier way
>>>> to trigger the offensive conditions, but that is conjecture...
>>>> 
>>> 
>>> I'm using this firmware:
>>> 
>>> https://kau.toke.dk/lede/airtime-fairness-builds/ar71xx/generic/lede-r1526%2B2-ar71xx-generic-archer-c7-v2-squashfs-factory.bin
>> 
>> Since this is based on LEDE r1526 it should contain the suspect
>> commits 372d0fea29e60b02154fd7176ba32e7742f6640e and
>> a894a535ff7e6c37bd853e951663130482bc0ff2, so this might be the exact
>> same issue. I seem to be able to force this issue with moving from
>> area of good reception to an area of bad reception (yeah for living in
>> an old house with massive brich walls), maybe that cild work for you
>> as well? I am not sure whether the issue is regarded by the LEDE
>> developers as very critical yet (and rightfully so IMHO, there are
>> only a few reports), so any added report might turn this more into the
>> development spot light…
> 
> The patches you are talking about went in as part of debugging the
> intermediate queueing implementation. Opening an issue on the LEDE bug
> tracker for this might be a good idea…

	I believe/hope I already did: https://bugs.lede-project.org/index.php?do=details&task_id=176 There are other reports of similar failures in the tracker, but I am not fully convinced they all have the exact same root cause. I would not be amazed if the commits I indicated above do not introduce real bugs, but rather expose existing issues by making the conditions to trigger the radio loss more likely. 

Best Regards
	Sebastian


> 
> -Toke


      reply	other threads:[~2016-09-19 11:36 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-16 21:42 Dave Taht
2016-09-17  8:33 ` Loganaden Velvindron
2016-09-17 17:12 ` Loganaden Velvindron
2016-09-17 17:26   ` Loganaden Velvindron
2016-09-17 17:33     ` Dave Taht
2016-09-17 17:35     ` Toke Høiland-Jørgensen
2016-09-17 17:50       ` Loganaden Velvindron
2016-09-18  5:39         ` Loganaden Velvindron
2016-09-18  6:19           ` Dave Taht
2016-09-18  6:27             ` Loganaden Velvindron
2016-09-18 14:24               ` Loganaden Velvindron
2016-09-18 20:50                 ` Sebastian Moeller
2016-09-19  3:56                   ` Loganaden Velvindron
2016-09-19  8:33                     ` moeller0
2016-09-19 11:27                       ` Toke Høiland-Jørgensen
2016-09-19 11:36                         ` moeller0 [this message]

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