[openib-general] Re: Re: user-mode verbs on Itanium

[Grant Grundler]

On Wed, May 04, 2005 at 10:09:10AM +0300, Michael S. Tsirkin wrote:
> I think ibv_pingpong is not the best latency benchmark - more of
> a test/usage example.

Well, this is the example newbies will follow when they want to
write code using the same interfaces.  Given the lack of documentation,
we really depend on good examples for people (like me) who have
never written code for any infiniband implementation.

> Since it has no pipelining, its also not the best bandwidth benchmark.

Yeah, I suspected that.

> Grant, if you want a latency benchmark you may want to look at
> contrib/mellanox/perftest.
> Its a variation on the pingpong test, showing how you can get latency
> between 3 and 4usec one-way, by using inline data on sends, and polling on data.

Ok - will do - thanks!

> I expect to put up a bandwidth test one of these days.

That would be good. Harping on the same theme as above, that might
be an opportunity to hack something into an existing benchmark
like netpipe or netperf.  Ie provide an example of how to adapt
an existing application to optimally use openib interconnect.

thanks,
grant