[openib-general] [ANNOUNCE] Contribute RDS (Reliable DatagramSockets) to OpenIB

[Yaron Haviv]

> -----Original Message-----
> From: openib-general-bounces at openib.org [mailto:openib-general-
> bounces at openib.org] On Behalf Of Richard Frank
> Sent: Thursday, December 01, 2005 1:03 PM
> To: Grant Grundler
> Cc: openib-general at openib.org
> Subject: Re: [openib-general] [ANNOUNCE] Contribute RDS (Reliable
> DatagramSockets) to OpenIB
> 
> We do not see any deficiencies - the RDS specification and current
> implementation so far meet our requirements and is working very well.
> 
> There is more we will want to do further down the road - such as
access
> the RDS sockets via AIO so we can add zero copy support.
> 

Richard,

In the document you published few weeks ago you listed latency and CPU%
as key goals 

I assume to really get the latency down you need a user space
implementation that can leverage on pooling, any plans to work in user
space ?

Several other comments/suggestions if I may add (may already took them
into account):

As a UDP consumer isn't there a need to support Multicast as well, and
potentially leverage on IB multicast for scalability ?

I feel that there is not much benefit in eliminating the reliability
checks in the upper (UDP) consumer, since its negligible in CPU or
latency overhead, you may even just go with a UC implementation, also
UDP consumers may want to use RDS without modifying the application, or
may accept dropped packets or over subscription (since they are
interested in the most recent data).

And it is very important to tie the RDS implementation to the IP stack
for routing information/resolution, ARPs, etc' 
So it would become transparent from the mng/configuration side as well,
not requiring separate configuration files, or dealing better with
dynamic environments and failures like a real UDP would.

Yaron

> 
> On Thu, 2005-12-01 at 08:16 -0800, Grant Grundler wrote:
> > On Tue, Nov 29, 2005 at 03:23:46PM -0800, Roland Dreier wrote:
> > > Any progress to report on the port of RDS from the SilverStorm
> > > proprietary stack to the standard Linux stack?  I think it would
> > > really move the discussion forward if there were some code that
people
> > > could build and use.
> >
> > As primary consumer of RDS, I think Oracle first needs to decide if
> > the deficiencies that Mike Krause pointed out are acceptable or not.
> >
> > grant
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