From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mike Snitzer Subject: Re: dm-mpath: Work with blk multi-queue drivers Date: Wed, 24 Sep 2014 20:13:41 -0400 Message-ID: <20140925001341.GA25145@redhat.com> References: <1411491802-7356-1-git-send-email-keith.busch@intel.com> <20140924145215.GA26398@infradead.org> <20140924183453.GA23052@redhat.com> <20140924184834.GB23052@redhat.com> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Content-Disposition: inline In-Reply-To: <20140924184834.GB23052@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: Keith Busch Cc: Christoph Hellwig , Jun'ichi Nomura , dm-devel@redhat.com List-Id: dm-devel.ids On Wed, Sep 24 2014 at 2:48pm -0400, Mike Snitzer wrote: > On Wed, Sep 24 2014 at 2:34pm -0400, > Mike Snitzer wrote: > > > > > I never did take the time to properly review Hannes' proposal but now > > that you're floating this blk-mq support for DM core (and DM mpath) I'm > > clearly going to have to take this all on in a much more focused way. > > > > Christoph/Hannes/Junichi/Keith/others, can you see a way forward that > > offers a lighter request-based DM that makes required callouts to (new?) > > block interfaces that helps us abstract the old request and blk-mq > > request allocation, etc? > > (sorry about replying to myself...) > > SO revisiting that thread from above, these posts stand out: > http://www.redhat.com/archives/dm-devel/2014-June/msg00026.html > http://www.redhat.com/archives/dm-devel/2014-June/msg00028.html > > I'd love to see us get rid of request-based DM's bio cloning for each > cloned request (we never did get an answer from the NEC guys to know > _why_ that was done). Actually, Junichi did respond with why: http://www.redhat.com/archives/dm-devel/2014-June/msg00033.html So this needs more review and thought.