[openib-general] Re: Problem configuring ipath_ether

[Caitlin Bestler]

openib-general-bounces at openib.org wrote:
> On Mon, Mar 27, 2006 at 08:18:28AM -0800, Shirley Ma wrote:
> 
>> Is it a good idea to send such a big messages size using UD mode?
> 
> The usual reason for not doing this with UDP is that it turns
> a small amount of packet loss into lots more lossage. This is
> a real issue with ethernet when it drops packets when there
> is congestion. With IB the error rate is consistantly low.

Don't you mean "when delivery is over a single subnet the
error/drop packet rate is consistently low."?

Over a long-haul connection is there any reason to expect that
a large message would fare better than with UDP? Especially since
the "cell size" would be smaller?