Adam Williamson wrote:
> They are supposed to hit mirrors at the same time; they're released as
> part of the same advisory. As far as I know, this has worked for all
> 2008 Spring kernel updates so far. I haven't had any other report of the
> driver not being updated when the kernel was.
>  
There is never a guarantee of this. An ML thread years ago established
that there was absolutely no correlation between when Mandriva dumps
stuff onto rsync.mandriva (or whatever it is these days) and when the
mirrors choose to rsync and pick it up.

What they pick up in any particular execution of rsync depends on the
state of the repository directory when rsync determines which files to
transfer. If this overlaps the updating of the MDV rsync host from
internal sources, you'll get a partial and inconsistent update.

So, whether Mandriva tries to "schedule" different packages to be in a
certain "advisory" unit or not, there is no guarantee that all such
packages will be transmitted as a group.