[ofa-general] max_mr limit

[Rajouri Jammu]

I was successfully able to register a total of 10GB of memory in 10M chunks.
In other words 1024 MRs of 10MB each.

On Mon, Mar 17, 2008 at 12:22 AM, Or Gerlitz <ogerlitz at voltaire.com> wrote:

> Rajouri Jammu wrote:
> > Does that mean that no matter how I size my memory regions the maximum
> > amount of (total) memory I can register is = 2^20 * 4K = 4GB?
> > I.e., Am I limited by the total number of MTTs?
> Generally speaking, yes, the IB network MMU (MTT this case) is limited
> in the number of slots it has and so in the amount of memory it can map
> at once, but I assume this is typical eg for I/O MMUs and makes sense.
>
> However, each slot can map --more-- then 4K, so one should be able to
> use huge-pages etc. I am not sure what is the actual status of
> registering huge-pages by the Linux IB stack, maybe Roland can comment
> on that.
>
> Or.
>
>
>
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