[Lustre-devel] IPv6 NIDs

[Isaac Huang]

On Tue, Oct 11, 2011 at 02:20:44PM +0100, Eric Barton wrote:
> ......
> IPv6 compatible NID:
> 
> 1. Minimum: 128 bit address-within-LNET + 32 bit LNET number.
>    160 bits / 20 bytes total.

(1) might cause alignment problem somewhere. I remember that the
PTLLND is picky on alignments, and there might be more such places.

> 2. Hedge a little by reserving an additional (say) 32 bits for
>    something we've not thought of yet and keeping the total a
>    multiple of 64 bits to simplify alignment.
>    192 bits / 24 bytes total.
> 
> 3. Hedge a lot with a nice round number.
>    256 bits / 32 bytes total.
> 
> (2) gets my vote currently...

I'd feel happy to pay the extra 8 bytes for the peace of mind that I
wouldn't have to handle this again.

- Isaac
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