[openib-general] IB: I don't like what I'm seeing.

Wed Mar 31 20:39:49 PST 2004

> -----Original Message-----
> From: ron minnich [mailto:rminnich at lanl.gov]
> Sent: Wednesday, March 31, 2004 8:11 PM
> 
> The only
> integrity you can get is end-to-end, and currently the only way to buy
> that is with software checksums. Which I find regrettable but so it
goes.
> I've done a NIC design or two and once made the same mistake myself of
> thinking I could guarantee data integrity -- turned out I could not.
It
> was good to know I was in such good company.

So back on the topic of UD vs. RC, if you have to do SW checksum anyway,
is there something to be gained in having the ability of doing HW
assisted large sends, RMDA, etc for the large scale HPC environment?
Does the assumption that the application is the only thing that can give
you end-to-end data integrity remove all value provided by RC/UC
services and RDMA?  Does the IB RC service have issues beside the lack
of reliability?

- Fab

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