> >> Please explain why the order of groups is important. I don't see it.
> >
> >When it has to be shortened because the NFS packets only have space
> >for a small number of groups....
> 
> In that case instead of truncating the group list one should check
> which groups are irrelevant to the operation and get rid of those.
> 
> christos

i don't think it's worth to break existing systems in this case.

YAMAMOTO Takashi