Re: Naive question on multiple TCP/IP channels and please dont start a uS NN debate here unless you really want to.

Michael Richardson <mcr@sandelman.ca> Fri, 06 February 2015 16:57 UTC

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From: Michael Richardson <mcr@sandelman.ca>
To: Jim Gettys <jg@freedesktop.org>
Subject: Re: Naive question on multiple TCP/IP channels and please dont start a uS NN debate here unless you really want to.
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Date: Fri, 06 Feb 2015 11:57:49 -0500
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Jim Gettys <jg@freedesktop.org> wrote:
    > ​What effect does this algorithm have in practice? Here are some examples:
    > o real time isochronous traffic​ (such as VOIP, skype, etc) won't build
    > a queue, so will be scheduled in preference to your bulk data.
    > o your DNS traffic will be prioritized.
    > o your TCP open handshakes will be prioritized
    > o your DHCP & RA handshakes will be prioritized
    > o your handshakes for TLS will be prioritized
    > o any simple request/response protocol with small messages.
    > o the first packet or so of a TCP transfer will be prioritized: remember,
    > that packet may have the size information needed for web page layout in it.
    > o There is a *positive* incentive for flows to pace their traffic (i.e.
    > to be a good network citizen, rather than always transmitting at line rate).

    > *All without needing any explicit classification.  No identification of
    > what application is running is being performed at all in this algorithm.*

This last part is I think the part that needs to be shouted at residential
ISPs on a regular basis.  I wish that the IETF and ISOC was better able to
do this... in particular to ISPs which do not tend to send the right people
to NANOG/RIPE/etc.

--
]               Never tell me the odds!                 | ipv6 mesh networks [
]   Michael Richardson, Sandelman Software Works        | network architect  [
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