Re: [ledbat] list of reasons for needing multiple TCP connections

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Hi, all,

It's useful to differentiate between TCP not getting full BW because it
uses only a single path, vs. TCP not getting full BW because its window
doesn't open fast enough.

SCTP addresses the former, not the latter; the two have the same problem
in the latter case. There are a variety of extensions to TCP's windowing
mechanism to address high BW*delay product environments which apply
equally well to SCTP in those cases.

Joe

Robb Topolski wrote:
> 
> 
> On Thu, Nov 20, 2008 at 2:54 PM, Caitlin Bestler <cait@asomi.com
> <mailto:cait@asomi.com>> wrote:
> 
>     As a point of reference, part of the justification for doing iSCSI
>     over multiple TCP connections within a session was because "It
>     might be impossible to achieve the full bandwidth capability
>     of the underlying physical transport by using a single TCP
>     connection."
> 
>     [http://storageconference.org/2003/papers/19-Meth-Design.pdf
>     section 2.2]
> 
> 
> Good stuff there, the relevant reasoning that might be sucked into a
> LEDBAT paper include:
> 
>               It might be impossible to achieve the full bandwidth capa-
>               bility of the underlying physical transport by using a sin-
>               gle TCP connection (possibly due to the TCP window
>               size and the round-trip-time of TCP acknowledgements
>               over long distances). Some protocols, like SCTP, auto-
>               matically and transparently distribute their traffic over a
>               number of connections in order to achieve the full band-
>               width. There may also be several physical interconnects
>               (i.e. separate cables) connecting the initiator and target,
>               and it would be most desirable to aggregate and simulta-
>               neously utilize all such existing physical connections.
>  
> 
> 
> -- 
> Robb Topolski (robb@funchords.com <mailto:robb@funchords.com>)
> Hillsboro, Oregon USA
> http://www.funchords.com/
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