[openib-general] ip over ib throughtput

[Diego Crupnicoff]

Note however that the relevant IB limit is the max ***message size*** which
happens to be equal to the ***IB*** MTU for the current IPoIB (that runs on
top of IB UD transport service where IB messages are limited to a single
packet).

A connected mode IPoIB (that runs on top of IB RC/UC transport service)
would allow IB messages up to 2GB long. That will allow for much larger
(effectively as large as you may ever dream of) ***IP*** MTUs, regardless of
the underlying IB MTU.

Diego

> -----Original Message-----
> From: Hal Rosenstock [mailto:halr at voltaire.com] 
> Sent: Wednesday, January 05, 2005 2:21 PM
> To: Peter Buckingham
> Cc: openib-general at openib.org
> Subject: Re: [openib-general] ip over ib throughtput
> 
> 
> On Wed, 2005-01-05 at 12:23, Peter Buckingham wrote:
> > stupid question: why are we limited to a 2K MTU for IPoIB?
> 
> The IB max MTU is 4K. The current HCAs support a max MTU of 2K.
> 
> -- Hal
> 
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