Lets make wifi fast again!
 help / color / mirror / Atom feed
From: Juliusz Chroboczek <jch@pps.univ-paris-diderot.fr>
To: dpreed@reed.com
Cc: "Aaron Wood" <woody77@gmail.com>,
	make-wifi-fast@lists.bufferbloat.net,
	"cerowrt-devel@lists.bufferbloat.net"
	<cerowrt-devel@lists.bufferbloat.net>,
	"babel-users@lists.alioth.debian.org"
	<babel-users@lists.alioth.debian.org>
Subject: Re: [Make-wifi-fast] [Babel-users] perverse powersave bug with	sta/ap mode
Date: Thu, 28 Apr 2016 15:37:43 +0200	[thread overview]
Message-ID: <87oa8tyhug.wl-jch@pps.univ-paris-diderot.fr> (raw)
In-Reply-To: <1461849006.60252745@apps.rackspace.com>

> Multicast is seductive to designers who ignore the realities of
> propagation and channel coding issues, because they think it works one
> way, but the reality is quite different.

Hold on.

Mulsticast is used for two distinct purposes: for broadcast-style
applications (streaming), and for discovery (ARP, ND, mDNS, and of course
the Hello beaconing of routing protocols).

For broadcast-style applications, multicast can be replaced with multiple
unicast streams, as Netflix shows, although this is best done at the
routers rather than at the senders, since this allows building a single
distribution tree without the need for application-layer proxies ("CDNs").

For discovery, multicast is unavoidable -- there's simply no way you're
going to send a unicast to a node that you haven't discovered yet.

-- Juliusz

  reply	other threads:[~2016-04-28 13:37 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-26 23:18 [Make-wifi-fast] " Dave Taht
2016-04-26 23:27 ` Aaron Wood
2016-04-26 23:32   ` David Lang
2016-04-28 13:10   ` dpreed
2016-04-28 13:37     ` Juliusz Chroboczek [this message]
2016-04-28 13:43       ` [Make-wifi-fast] [Babel-users] " Toke Høiland-Jørgensen
2016-04-28 14:16         ` dpreed
2016-04-28 14:59           ` Juliusz Chroboczek
2016-04-28 15:44             ` Dave Taht
2016-04-28 16:09               ` Dave Taht
2016-04-28 17:10               ` [Make-wifi-fast] Multicast IHUs [was: perverse powersave bug with sta/ap mode] Juliusz Chroboczek
2016-04-28 17:46                 ` Dave Taht
2016-04-28 17:53                   ` [Make-wifi-fast] [Babel-users] " Henning Rogge
2016-04-28 18:46                   ` [Make-wifi-fast] Multicast IHUs Juliusz Chroboczek
2016-04-28 18:04                 ` [Make-wifi-fast] Multicast IHUs [was: perverse powersave bug with sta/ap mode] Dave Taht
2016-04-28 17:28               ` [Make-wifi-fast] Layering " Juliusz Chroboczek
2016-04-28 15:04         ` [Make-wifi-fast] [Cerowrt-devel] [Babel-users] perverse powersave bug with sta/ap mode moeller0
2016-04-28 16:05           ` [Make-wifi-fast] [Babel-users] [Cerowrt-devel] " Henning Rogge
2016-04-28 16:52             ` Dave Taht
2016-04-28 16:59               ` Henning Rogge
2016-04-28 18:54           ` [Make-wifi-fast] [Cerowrt-devel] [Babel-users] " Juliusz Chroboczek
2016-04-28 19:12             ` [Make-wifi-fast] [Babel-users] [Cerowrt-devel] " Henning Rogge
2016-04-28 19:29               ` Juliusz Chroboczek
2016-04-28 19:33                 ` Henning Rogge
2016-04-28 19:55                   ` Juliusz Chroboczek
2016-04-28 13:33   ` [Make-wifi-fast] [Babel-users] " Juliusz Chroboczek
2016-04-28 13:32 ` Juliusz Chroboczek
2016-05-12  0:28 ` [Make-wifi-fast] " Dave Taht

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=87oa8tyhug.wl-jch@pps.univ-paris-diderot.fr \
    --to=jch@pps.univ-paris-diderot.fr \
    --cc=babel-users@lists.alioth.debian.org \
    --cc=cerowrt-devel@lists.bufferbloat.net \
    --cc=dpreed@reed.com \
    --cc=make-wifi-fast@lists.bufferbloat.net \
    --cc=woody77@gmail.com \
    /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