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Re: p1-message-07 S 7.1.4

From: Henrik Nordstrom <henrik@henriknordstrom.net>
Date: Tue, 21 Jul 2009 17:36:24 +0200
To: Jamie Lokier <jamie@shareable.org>
Cc: HTTP Working Group <ietf-http-wg@w3.org>
Message-Id: <1248190584.23873.410.camel@localhost.localdomain>
tis 2009-07-21 klockan 13:50 +0100 skrev Jamie Lokier:
> Roughly speaking, people use download managers which open lots of
> connections to get higher throughput with large files.
> 
> The fact that works at all is an indication that something, somewhere
> is broken.  Under normal circumstances, a single TCP connection will
> attain close to the maximum throughput for a route.  Needing multiple
> connections to download a single file is a sign that you're working
> around artificial limits, such as policy limits or broken link bonding.

There is also the issue of many TCP implementations having way too small
default TCP window to be able to utilize the bandwidth available today
effectively with a single connection. Fortunately the support for larger
TCP windows has been improving significantly lately.

Regards
Henrik
Received on Tuesday, 21 July 2009 15:37:00 GMT

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