[openib-general] basic IB doubt

[Greg Lindahl]

On Thu, Aug 24, 2006 at 03:53:37PM -0700, Woodruff, Robert J wrote:

> If the overhead in polling the CQ rather than memory was not so
> high, they would have used it, but they found that it added > 2us to
> the latency and found they could get better performance if they
> polled memory,

I keep on mentioning that measuring one instance of one implementation
isn't necessarily a good way to evaluate a standard. Or the
implementation.

We already have one example where Mellanox improved their
implementation in the DDR generation such that a performance
workaround -- choosing a 1k MTU for RC connections -- was no longer
needed. I was pleased when we all agreed to remove defaulting to the
workaround -- it was clearly the right thing to do.

-- g