From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Benjamin Marzinski" Subject: Re: dm-multipath low performance with blk-mq Date: Tue, 26 Jan 2016 15:40:35 -0600 Message-ID: <20160126214035.GU24960@octiron.msp.redhat.com> References: <569E11EA.8000305@dev.mellanox.co.il> <20160119224512.GA10515@redhat.com> <20160125214016.GA10060@redhat.com> <20160126160324.GA24665@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: <20160126160324.GA24665@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: Mike Snitzer Cc: "keith.busch@intel.com" , Sagi Grimberg , "linux-nvme@lists.infradead.org" , Christoph Hellwig , dm-devel@redhat.com, Bart Van Assche List-Id: dm-devel.ids On Tue, Jan 26, 2016 at 11:03:24AM -0500, Mike Snitzer wrote: > > Christoph, any chance you could rebase your 'nvme-loop.2' on v4.5-rc1? > > Or point me to a branch that is more current... Failing that, you could try using the null_blk device directly. It doesn't provide enough information for multipathd to set up a device on it, but you could manually create one with dmsetup. Without multipathd you won't get failback working, but it should be good fine for performance work. -Ben > > -- > dm-devel mailing list > dm-devel@redhat.com > https://www.redhat.com/mailman/listinfo/dm-devel