[ofa-general] limit on memory registration

[Dotan Barak]

Rui Machado wrote:
> Hi all,
>
> is there any limitation on the size that can be registered
> (ibv_reg_mr) for communication?
> I seem to be limited to 16GB (on 32GB 64bit x86 machine).
> Is this normal? Can someone tell me why and/or if there is a workaround?
>   
In the device attributes there is an attribute called max_mr_size which 
indicate the maximum block size
that can be registered for a device.

There is one more limitation which is a device specific for the 
translation table virtual <-->physical
You can check the low level driver of the HW that you are using in order 
to increase the size
of this table.

which HW do you use?

Dotan

> Thank you very much for the help.
>
> Cheers,
> Rui
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