From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Hellwig Subject: Re: ANNOUNCE: SCSI XCOPY support for the kernel and device mapper Date: Tue, 15 Jul 2014 11:55:13 -0700 Message-ID: <20140715185513.GA5331@infradead.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from bombadil.infradead.org ([198.137.202.9]:41928 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932826AbaGOSzQ (ORCPT ); Tue, 15 Jul 2014 14:55:16 -0400 Content-Disposition: inline In-Reply-To: Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Mikulas Patocka Cc: "Alasdair G. Kergon" , Mike Snitzer , Jonathan Brassow , Edward Thornber , "Martin K. Petersen" , Jens Axboe , dm-devel@redhat.com, linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org On Tue, Jul 15, 2014 at 02:33:13PM -0400, Mikulas Patocka wrote: > Hi > > I annouce that I released the first version of a patch set that makes it > possible to use SCSI XCOPY offload for the block layer and device mapper. > > The patchset is at > http://people.redhat.com/~mpatocka/patches/kernel/xcopy/series.html It > requires kernel version at least 3.16-rc4. It was tested on target-core > iSCSI implementation. Can you send the series to the mainling list(s)? That makes it a lot easier to do a quick review. > The dm-kcopyd subsystem is modified to use the XCOPY command, so device > mapper targets that use it (mirror, snapshot, thin, cache) take advantage > of copy offload automatically. That sounds good, do you have any benchmarking data that shows the advantage of using XCOPY?