[openib-general] QP with large starting sequence adds latency to RDMA READ???

[Sean Hefty]

Arlin Davis wrote:
> I just noticed some RDMA read performance issues that seem to be related 
> to the QP starting sequence number. If I set the starting sequence to 1 
> then all is fine but if I set it to 0x10000 then it seems to add ~40us 
> to my 32KB RDMA read operation (polling for completions). Has anyone 
> seen anything like this?

Has anyone else noticed this issue?  You could try to reproduce this by using 
the rdma_bw test and changing the PSN.

- Sean