Lets make wifi fast again!
 help / color / mirror / Atom feed
From: Juliusz Chroboczek <jch@irif.fr>
To: Dave Taht <dave.taht@gmail.com>
Cc: babel-users@lists.alioth.debian.org,
	Make-Wifi-fast <make-wifi-fast@lists.bufferbloat.net>
Subject: Re: [Make-wifi-fast] [Babel-users] reducing delays in wifi mcast queues
Date: Wed, 19 Sep 2018 02:04:25 +0200	[thread overview]
Message-ID: <8736u6cpyu.wl-jch@irif.fr> (raw)
In-Reply-To: <CAA93jw6oiCXgvmsdzhUmhtHy_fq5pKCQE4HE0-9BBthCGrS-Vw@mail.gmail.com>

> Recently I tried to deploy a few babel 1.8.2 nodes with the latest
> openwrt, which I had to back out rapidly because I was dropping so many
> babel packets under contention.

That's interesting.  Could I please see a log?

> A patch to universally enable babel ecn in net.c "solves" this problem,

Interesting.  AFAIK, ECN is only considered by AQM queues, so this implies
there's a queue in the way that's dropping Babel packets.  Perhaps this
queue could be convinced to treat Babel packets specially without having
to hack around it using ECN?  Or perhaps, if we know which queue that is,
we could modify Babel's packet scheduling to be more AQM friendly?

-- Juliusz

  reply	other threads:[~2018-09-19  0:04 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-19  4:15 [Make-wifi-fast] " Dave Taht
2018-09-18 23:19 ` [Make-wifi-fast] [Babel-users] " Juliusz Chroboczek
2018-09-18 23:31   ` Dave Taht
2018-09-19  0:04     ` Juliusz Chroboczek [this message]
2018-09-19  0:07       ` Jonathan Morton
2018-09-19  0:32       ` Dave Taht
2018-09-19  0:43         ` Juliusz Chroboczek
2018-09-19  0:53           ` Dave Taht
2018-09-19  6:05           ` Jonathan Morton

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

  List information: https://lists.bufferbloat.net/postorius/lists/make-wifi-fast.lists.bufferbloat.net/

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=8736u6cpyu.wl-jch@irif.fr \
    --to=jch@irif.fr \
    --cc=babel-users@lists.alioth.debian.org \
    --cc=dave.taht@gmail.com \
    --cc=make-wifi-fast@lists.bufferbloat.net \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox