> > > Another question, why the xbd driver cannot use the DIOCSSTRATEGY
> > > to change the strategy?
> > 
> > it isn't straightforward as the queue is shared among xbd instances.
> 
> But I don't see anything which would prevent from doing it. We just need
> to keep a list of all xbd device to be able to change sc_bufq for all of
> them.

well, i don't think it's impossible, of course. :-)

YAMAMOTO Takashi