> > - changes in conf/files are unnecessary.
> 
> Why? if we don't add all bufq_* files, we'll have to specify them via
> "options BUFQ_foo", am I wrong?

right.  what's wrong with it?

> > - disk_set_sched is very broken.  do you understand how bufq works?
> 
> No :-) this is why I need help... can you explain me what's the
> required bit?

sorry, explaining how to implement the functionality in english
likely takes far much time for me than implementing it by myself.
please read the code. :)

i think that the best way is refining bufq interface
to stop embedding bufq_state in softc.

YAMAMOTO Takashi