[openib-general] [PATCH for-2.6.21] IPoIB/cm: improve small message bandwidth

[Roland Dreier]

 > 1. Is there something special you do when you run the benchmark (msi, taskset, ...)?

Yes, I am using MSI-X, and I pin the interrupt handler to one CPU
(CPU#0 in my particular case).  Then I use taskset to pin the NPtcp
process to a CPU in a different package (CPU#2 in my system).

BTW with these same systems, I am getting up to ~1150 MB/sec of
throughput with DDR mem-free Arbel, as measured with NPtcp.

 > 2. On a wild guess that the issue here is higher interrupt rate with CM,
 >    is there a chance you could test the following patch posted by me earlier?
 >    http://www.mail-archive.com/openib-general@openib.org/msg29290.html

OK, I'll try that when I get a chance.

 - R.