Messages in this thread | | | Date | Fri, 29 Apr 2005 12:33:54 -0700 | From | Grant Grundler <> | Subject | Re: [openib-general] Re: RDMA memory registration |
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On Fri, Apr 29, 2005 at 08:22:24PM +0200, Brice Goglin wrote: > For instance, instead of adding PROT_DONT/ALWAYSCOPY, you may use > an ioproc hook in the fork path. This hook (a function in your driver) > would be called for each registered page. It will decide whether > the page should be pre-copied or not and update the registration > table (or whatever stores address translations in the NIC). > In addition, the driver would probably pre-copy cow pages when > registering them.
This doesn't scale well as more cards are added to the box. I think I understand why it's good for single cards though.
> It's nice to see these two works coming to LKML at the same time. > It would be great if we could merge them and get a generic solution > that's suitable to both registration based cards (IB/Myri/Ammasso) > and MMU-based cards (Quadrics).
Aren't the mellanox mem-free cards more or less MMU's as well? I had that impression after attending Dror Goldberg's talk though I don't think he asserted that. Openib.org developers conf (Feb 2005) slideset is here: http://www.openib.org/docs/oib_wkshp_022005/memfree-hca-mellanox-dgoldenberg.pdf
Being mostly clueless about Quadrics implementation, I'm probably missing something that makes Quadrics a MMU but not the IB variants. Can someone clue me in please?
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