Re: [nbs] NBS assumptions: What can change?(was: Re: NBS and TCP connection identification)

Brian E Carpenter <brian.e.carpenter@gmail.com> Tue, 05 October 2010 20:27 UTC

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Date: Wed, 06 Oct 2010 09:28:40 +1300
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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To: Javier Ubillos <jav@sics.se>
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Subject: Re: [nbs] NBS assumptions: What can change?(was: Re: NBS and TCP connection identification)
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On 2010-10-06 00:29, Javier Ubillos wrote:

>>  From what I understand from folks at Google a significant part of the 
>> "connection setup" is actually the DNS lookup,

This isn't news. Many years ago, Christian Huitema did a survey of
where the time went in fetching web pages. In 1996, the DNS lookup
was 13% of the total time to load a page, and establishing the actual
connection was only 12%. The full data that he gave:

DNS 13%
Connect 12%
Prepare 33% (i.e. the pause between sending the GET and starting to receive the reply)
Transmit 42%

Data presented at Interop (Paris) in early 1997, but has this really changed?

If we can still learn from this: optimising the lookup/connect phase is
only optimising 25% of the total time as far as the user is concerned.
And half that time is DNS lookup in every possible scenario. Optimising
the connect phase is only optimising 12% of the total time.

    Brian