"Michael S. Tsirkin" <> writes:
> On Fri, Sep 13, 2013 at 10:40:40AM +0930, Rusty Russell wrote:
>> "Michael S. Tsirkin" <> writes:
>> > ++------------+---------------------------------+
>> > +| Virtqueue Part | Alignment | Size |
>> > ++------------+---------------------------------+
>> > ++------------+---------------------------------+
>> > +| Descriptor Table | 16 | 16 * qsz |
>>
>> Alignment 16: isn't that overkill?
>
> Why overkill? 16 bytes is exactly a single descriptor size,
> aligning descriptor buffer to descriptor size seems sensible,
> it simplifies translation: this we never cross a page boundary
> in the middle of descriptor.
Otherwise I was thinking 8 byte alignment (the largest element). But
the page boundary point makes great sense.
Cheers,
Rusty.
