[Beowulf] Thoughts on IB EDR and Intel OmniPath

[Mikhail Kuzminsky]

> 
	from :Joe Landman <landman at scalableinformatics.com>:
>
>
> 
Even with RoCE2, some of the testing we did 
>demonstrated very significant congestion related slowdowns that we 
>couldn't easily tune for (with PFC and other bits that RoCE needs).
>
>I've used iWARP in the dim and distant past, and it was much better than 
>plain old gigabit on the same systems (with Ammasso cards). -- BTW, this gives the question about choice between RoCE vs iWARP. Does your "Even with RoCE2" means that iWARP is more bad than RoCE ?  

Mikhail Kuzminsky,
Zelinsky Institute of Organic Chemistry RAS,
Moscow
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