[e2e] Google seeks to tweak TCP

Tue Jan 24 04:58:03 PST 2012

I have to agree with this.  TCP is ugly for Application Layer FEC.

...Daniel

--- On Tue, 1/24/12, Jon Crowcroft <Jon.Crowcroft at cl.cam.ac.uk> wrote:

> From: Jon Crowcroft <Jon.Crowcroft at cl.cam.ac.uk>
> Subject: Re: [e2e] Google seeks to tweak TCP
> To: L.Wood at surrey.ac.uk
> Cc: craig at aland.bbn.com, Jon.Crowcroft at cl.cam.ac.uk, end2end-interest at postel.org
> Date: Tuesday, January 24, 2012, 3:01 AM
> well, perhaps - sometimes, i just
> wish TCP would simply get out of the way...
> 
> In missive <FD7B10366AE3794AB1EC5DE97A93A3733E2E70D2E4 at EXMB01CMS.surrey.ac.uk>,
> L.Wood at surrey.ac.uk
> typed:
> 
>  >>Can it be argued that google is attacking the wrong
> layer?
>  >>
>  >>TCP was not 'designed to deliver the Web's
> content.' TCP predates the web and http by decades. The
> internet and TCP user base is rather larger than google's
> user base of web customers.
>  >>
>  >>TCP was indeed designed to operate over 'a huge
> range of network types', and decreasing TCP RTO while
> increasing initial windows decreases TCP's tolerance of the
> range of networks it can support.
>  >> I look forward to seeing the knock-on effects of
> decreasing the initial TCP RTO to one second (e.g.
> interactions with Mobile IP).
>  >>
>  >>Improved and more widely deployed HTTP persistence
> and pipelining would help; Google's SPDY at least nods to
> that. Those are germane to web use, and thus to Google's
> customers. Tweaking (improving?) TCP, not so much.
>  >>
>  >>
>  >>Lloyd Wood
>  >>http://sat-net.com/L.Wood/
>  >>
>  >>
>  >>________________________________________
>  >>From: end2end-interest-bounces at postel.org
> [end2end-interest-bounces at postel.org]
> On Behalf Of Craig Partridge [craig at aland.bbn.com]
>  >>Sent: 23 January 2012 21:18
>  >>To: end2end-interest at postel.org
>  >>Subject: [e2e] Google seeks to tweak TCP
>  >>
>  >>Craig
>  >>
>  >>E-mail: craig at aland.bbn.com
> or craig at bbn.com
>  >>
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>  >>Subject: [ PRIVACY Forum ]  Google: Let's Make
> TCP Faster
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>  >>
>  >>
>  >>Google: Let's Make TCP Faster
>  >>
>  >>http://j.mp/Af4pgb (Google Code Blog)
>  >>
>  >>   "Transmission Control Protocol
> (TCP), the workhorse of the Internet, is
>  >>    designed to deliver all the Web's
> content and operate over a huge
>  >>    range of network types. To deliver
> content effectively, Web browsers
>  >>    typically open several dozen parallel
> TCP connections ahead of making
>  >>    actual requests. This strategy
> overcomes inherent TCP limitations but
>  >>    results in high latency in many
> situations and is not scalable.  Our
>  >>    research shows that the key to
> reducing latency is saving round trips.
>  >>    We're experimenting with several
> improvements to TCP. Here's a summary
>  >>    of some of our recommendations to
> make TCP faster ..."
>  >>
>  >> - - -
>  >>
>  >>- --Lauren--
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> http://www.vortex.com/lauren =
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> 
>  cheers
> 
>    jon
> 
> 