Hey, Christoph.

On Wed, Jun 04, 2014 at 07:31:36AM -0700, Christoph Hellwig wrote:

I don't really think there's anything inherently counter productive
to spinning rust (at least for somewhat modern spinning rust and
infrastructure) in blk-mq.  I'd really like to get rid of the old
request layer in a reasonable amount of time, and for SCSI I'm very
reluctant to add more integration between the old and new code.  I'd
really planning on not maintaining the old request based SCSI code
for a long time once we get positive reports in from users of various
kinds of older hardware.

Hmmm... the biggest thing is ioscheds.  They heavily rely on being
strongly synchronized and are pretty important for rotating rusts.
Maybe they can be made to work with blk-mq by forcing single queue or
something but do we wnat that?

Thanks.

-- 
tejun