[openib-general] IB multicast

[Chevchenkovic Chevchenkovic]

Hi,
  I have a configuration consisting of 6 nodes connected through a single IB
switch. I am sending data from a single node to all the remaining 5 nodes
using IB multicast. I get a bandwidth of not more than 1.5 - 2 Gbps. I was
expecting it to be around 10 Gbps(i.e same as point to point b/w). Bandwidth
here is defined as (total sent data from the source)/(time for getting
completion acks from all the 5 nodes on receiving source data).
  1. What could be the reason?
  2. What is the expected bandwidth?

 regards,
-Chev
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.openfabrics.org/pipermail/general/attachments/20061003/114f5422/attachment.html>