[openib-general] ibv_reg_mr limits?

[Bernhard Fischer]

On Tue, May 17, 2005 at 08:07:32AM -0700, Roland Dreier wrote:
>    Arlin> Is there a memory registration limit with ibv_reg_mr?  My
>    Arlin> pingpong test returns error when trying to register 100 MB
>    Arlin> of memory on my server with 1GB of memory.
>
>mthca (in the kernel) currently implements memory registration in a
>fairly stupid way that requires it to allocate a contiguous chunk of

Any timeframe on when this will be changed?

I'm right now seeing a bunch of "rank XYZ reg mr failed!" in my
test-applet which are my fault, but i wonder if -- after having fixed my
test-applet -- i should go and boot with mem=384M and make mthca handle
the rest of the mem on its own, as a temporary workaround

>memory to hold the entire page table of the memory region being
>registered.  This can be fixed but right now I would expect the limit
>on a single registration to be ~64 MB (or less if memory is fragmented).
>
> - R.
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