[AG-TECH] AG & MTU Size

[Colin Perkins]

--> "Mike Weaver - MICS/USDOE" writes:
>Does anyone have any information or has anyone done any research on the
>effect of MTU size on the AG?  The Joint Engineering Team (JET) of the Large
>Scale Networking (LSN) group of the Interagency Working Group on IT R&D
>(IWG/ITRD) out of the National Coordination Office for Information
>Technology Research and Development (NITRD) reporting to the Whitehouse
>Office of Science and Technology Policy and the National Science and
>Technology Council - whew...that's a mouthful! - is suggesting an MTU size
>of 9K+.
>
>Does anyone know the effects of trying to tune Windows/Linux's TCP/IP stacks
>to work with 9000-byte MTUs?  How about the video and audio tools
>(vic/rat) - any issues that anyone might know about?

As shipped, both vic and rat have a 1500 octet maximum packet size hard
coded. This can easily be increased, if you're willing to recompile the
tools.

Increasing the packet size might help vic if you use a codec that generates
large frames. It won't help with rat, since none of the audio codec frames
are that large (and bundling multiple frames per packet just increases the
latency).

Colin