Re: [tcmtf] Improved version (v8) of the TCM-TF charter draft

"Eggert, Lars" <lars@netapp.com> Thu, 28 November 2013 10:53 UTC

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From: "Eggert, Lars" <lars@netapp.com>
To: "Reinaldo Penno (repenno)" <repenno@cisco.com>
Thread-Topic: [tcmtf] Improved version (v8) of the TCM-TF charter draft
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Date: Thu, 28 Nov 2013 10:53:08 +0000
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Subject: Re: [tcmtf] Improved version (v8) of the TCM-TF charter draft
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Hi,

On 2013-11-27, at 17:23, Reinaldo Penno (repenno) <repenno@cisco.com> wrote:
> Let¹s suppose XBOX gaming traffic compressed and bandwidth is reduced by
> 20%. Netflix detects there is much more bandwidth and TCP opens its window
> to engulf that new 20% available.  You are mostly back to where you were.
> So, if you go throughout the trouble of compressing some traffic, would
> that need to be couple with some protection?

this is a key point.

WAN acceleration works, because all traffic goes through the tunnel, and the tunnel endpoints prioritize flows. Well, and because they basically disable congestion control, so they can grab max bandwidth for the tunnel.

If you only tunnel some of the packets and let others flow past the tunnel, you have the issue Reinaldo raises. Even if you tunnel everything, unless you use aggressive non-IETF-standardized congestion control for the tunnel, other cross traffic can steal the bandwidth you just freed up by compressing.

Lars