[ofa-general] limit on memory registration

[Rui Machado]

Hi Dotan

>> 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.

I have a value of 131056 (printed as an int). How can I decode this?

>
> 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?
>

Mellanox
ca type:25218 (vendor_part_id)
fw_version : 5.1.400 (fw_ver)
hw_version : a0 (hw_ver)

Thank you