[ofa-general] local DMA transfer?

[Yicheng Jia]

Hi Dotan,

Does HCA provide any internal route for local DMA so that local data 
transfer doesn't has to go out of the HCA port as regular QPs do? In 
another word, it's not efficient to use QPs for local DMA transfer, is it 
true?

Thanks!

Yicheng Jia

Software Engineer
Toshiba Medical Research Institute USA, Inc.
Phone: 847-573-6625
Fax: 847-367-5272



Dotan Barak <dotanba at gmail.com> 
01/17/2009 05:38 AM

To
Yicheng Jia <YJia at tmriusa.com>
cc
general at lists.openfabrics.org
Subject
Re: [ofa-general] local DMA transfer?






Yicheng Jia wrote:
>
> Hi Folks,
>
> Is it possible to do local DMA transfer using QPs in a single port 
> HCA? Thanks!
>
> Best,
Hi.

If the question is can i use DMA from local QPs (both QPs are in the 
same HCA), then the answer is yes.

The QPs can be located everywhere, even in the same HCA, or between two 
different HCAs in the same machine
(as long as they are in the same IB fabric).

Dotan

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