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

Wed Mar 31 21:21:35 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?

IMHO, Yes once we can prove it scales.

>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?

IMHO No.

>Does the IB RC service have issues beside the lack
>of reliability?

At the present time, I can not say.

>
>- Fab
>
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