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Re: [hybi] CML

Dave Cridland <dave@cridland.net> Mon, 23 August 2010 16:54 UTC

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Date: Mon, 23 Aug 2010 17:55:25 +0100
From: Dave Cridland <dave@cridland.net>
To: Brian Smith <brian@briansmith.org>, Server-Initiated HTTP <hybi@ietf.org>
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Subject: Re: [hybi] CML
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On Mon Aug 23 17:46:29 2010, Brian Smith wrote:
> Also, I joined the list late. Was there already a discussion about  
> the merits of optimizing framing below the TCP/IP MTU? In  
> particular, what is the motivation for optimizing the overhead of a  
> 128 byte message when even a 512-byte message will still only  
> require a single packet?

Makes a lot of difference to mobile cases, particularly 3G. A  
low-traffic connection using <128 octet packets (including TCP/IP  
overhead) will use less than half the power of a high-bandwidth one  
based on radio state alone.

This threshold is under operator control, so in principle a  
particular mobile network could choose something other than 128  
octets, but I've not seen that case. Maybe some proper mobile people  
might comment.

Either way, at 128 octets and below, every byte counts.

Above that level, I agree it's generally a case of packets rather  
than octets.

Dave.
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