Sean Hefty wrote:
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
I added a starting PSN and RDMA READ option to the rdma_bw test and was
able to reproduce on a PCI-E adapter with 4.6.2 firmware. I retried on a
system with 4.7.0 and it looks like the problem is fixed. However, I
see nothing about this problem in the "bug fix" list in the release
notes. Can someone at Mellanox confirm this problem with RDMA reads and
add to release notes as a fix so it is documented somewhere?
http://www.mellanox.com/products/fw_images/fw-25208-4_7_0-release_notes.pdf
-arlin
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