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From: Loganaden Velvindron <loganaden@gmail.com>
To: Jim Gettys <jg@freedesktop.org>
Cc: "Toke Høiland-Jørgensen" <toke@toke.dk>,
	make-wifi-fast@lists.bufferbloat.net,
	linux-wireless <linux-wireless@vger.kernel.org>,
	"Felix Fietkau" <nbd@nbd.name>
Subject: Re: [Make-wifi-fast] [PATCH] mac80211: Dynamically set CoDel parameters per station.
Date: Sun, 11 Sep 2016 07:16:58 +0400	[thread overview]
Message-ID: <CAOp4FwT-Xf5_RnQCOg6Jh_ogHQ3nzcpx-gFS-mmPhOn-aMG3xQ@mail.gmail.com> (raw)
In-Reply-To: <CAGhGL2D8Hfed0VTsinnCbkK31dGTc=bYjzpPfrcLRnp+x6O3sA@mail.gmail.com>

On Sat, Sep 10, 2016 at 11:54 PM, Jim Gettys <jg@freedesktop.org> wrote:
>
>
> On Sat, Sep 10, 2016 at 3:33 PM, Toke H=C3=B8iland-J=C3=B8rgensen <toke@t=
oke.dk>
> wrote:
>>
>> CoDel can be too aggressive if a station sends at a very low rate,
>> leading to starvation. This gets worse the more stations are present, as
>> each station gets more bursty the longer the round-robin scheduling
>> between stations takes.
>>
>> This adds dynamic adjustment of CoDel parameters per station. It uses
>> the rate selection information to estimate throughput and sets more
>> lenient CoDel parameters if the estimated throughput is below a
>> threshold. To not change parameters too often, a hysteresis of two
>> seconds is added.
>
>
> Where is this 2 second constant coming from?  I'd expect it should be of
> order the maximum RTT (or a small constant factor of that, which for
> intercontinental connections should be 200-300ms.
>

Indeed, from Mauritius (Africa) to remote countries like Australia, or
parts of the US, we see latencies of up to 500-600ms.

  parent reply	other threads:[~2016-09-11  3:16 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-10 19:33 [PATCH] mac80211: Dynamically set CoDel parameters per station Toke Høiland-Jørgensen
2016-09-11  0:09 ` kbuild test robot
     [not found] ` <CAGhGL2D8Hfed0VTsinnCbkK31dGTc=bYjzpPfrcLRnp+x6O3sA@mail.gmail.com>
2016-09-10 20:09   ` [Make-wifi-fast] " Toke Høiland-Jørgensen
2016-09-11  3:16   ` Loganaden Velvindron [this message]
2017-04-05 16:18 ` [PATCH v2] " Toke Høiland-Jørgensen
2017-04-06  7:56   ` kbuild test robot
2017-04-06  8:45   ` kbuild test robot
2017-04-06  9:38   ` [PATCH v3] " Toke Høiland-Jørgensen
2017-04-06 10:51     ` [Make-wifi-fast] " Eric Dumazet
2017-04-06 15:58       ` Toke Høiland-Jørgensen
2017-04-13 18:26         ` Dave Taht
2017-05-17 14:06     ` Johannes Berg
2017-05-19  9:27       ` Toke Høiland-Jørgensen

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