[openib-general] Re: [PATCH] [RFC] - example user mode rdma ping/pongprogram using CMA

[Steve Wise]

On Wed, 2006-02-08 at 18:45 +0200, Michael S. Tsirkin wrote:
> Quoting r. Steve Wise <swise at opengridcomputing.com>:
> > Subject: [PATCH] [RFC] - example user mode rdma ping/pongprogram using CMA
> > 
> > All,
> > 
> > Attached is a user-mode program, called rping, that uses librdmacm and
> > libibverbs to implement a ping-pong program over an RC connection.  The
> > program utilizes SEND, RECV, RDMA READ, and WRITE ops, as well as cq
> > channels to get cq events, and rdma_get_event() to detect CMA events.
> > It is multi-threaded.  
> > 
> > I've built it as an example program in librdmacm/examples and tested it
> > with mthca.  It is useful to test CMA as well as all the major rdma
> > operations in a transport-neutral way.
> > 
> > If you all find it has utility, please pull it into librdmacm/examples.
> > 
> > 
> > Signed-off-by: Steve Wise <swise at opengridcomputing.com>
> 
> Steve, looks like you have at most a single receive work request posted at the
> receive workqueue at all times.
> If true, this is *really* not a good idea, performance-wise, even if you
> actually have at most 1 packet in flight.

Hey Michael,

There is at most only one SEND in flight.  This is a test program, not a
performance program.  Its goal is to utilize SEND, RECV, RDMA READ, and
RDMA WRITE as well as CMA to setup the connection...

Thanks,

Steve.