[ofa-general] Setting the rate in Infiniband.

[Jason Gunthorpe]

On Wed, Aug 05, 2009 at 08:03:04PM -0400, Ashwath Narasimhan wrote:

> The reason why I need such small rates is because I interface the
> Infiniband HCA to an FPGA via an Infiniband physical link.  Imagine
> the FPGA as a simple repeater that simply forwards the infiniband
> signals to the Target HCA. The FPGA cannot handle such a high data
> rate and neither do I have as much memory as required to buffer it
> on the FPGA (I might drop packets if the buffer becomes full). Hence
> I wish to limit the rate to say 100Mbps instead of 2.5Gbps.

The correct thing to do is manage the flow control credits you are
giving to the IB network so you don't loose packets.

Jason