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Petersen" Organization: Oracle Corporation References: <20190913111610.9958-1-robert.baldyga@intel.com> <20190913143709.GA8525@lst.de> <850977D77E4B5C41926C0A7E2DAC5E234F2C9C09@IRSMSX104.ger.corp.intel.com> <20190916073455.GA25515@lst.de> <850977D77E4B5C41926C0A7E2DAC5E234F2C9D03@IRSMSX104.ger.corp.intel.com> <20190917163909.GB34045@C02WT3WMHTD6.wdl.wdc.com> <20190918132611.GA16232@lst.de> <20190918170807.GA50966@C02WT3WMHTD6> <20190918170956.GA19639@lst.de> Date: Wed, 18 Sep 2019 20:40:05 -0400 In-Reply-To: <20190918170956.GA19639@lst.de> (Christoph Hellwig's message of "Wed, 18 Sep 2019 19:09:56 +0200") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.92 (gnu/linux) MIME-Version: 1.0 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9384 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=721 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1909190003 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9384 signatures=668685 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=797 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1909190003 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190918_174031_659656_A1822EE3 X-CRM114-Status: GOOD ( 17.02 ) X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "sagi@grimberg.me" , "linux-kernel@vger.kernel.org" , "linux-nvme@lists.infradead.org" , "axboe@fb.com" , "Baldyga, Robert" , Keith Busch , "Rakowski, Michal" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org Christoph, > On Wed, Sep 18, 2019 at 11:08:07AM -0600, Keith Busch wrote: >> And yes, that bouncing is really nasty, but it's really only needed for >> PRP, so maybe let's just not ignore that transfer mode and support >> extended metadata iff the controller supports SGLs. We just need a >> special SGL setup routine to weave the data and metadata. > > Well, what is the point? If people really want to use metadata they > should just buy a drive supporting the separate metadata pointer. In > fact I haven't had to deal with a drive that only supports interleaved > metadata so far given how awkward that is to deal with. Yep. There's a reason we did DIX... -- Martin K. Petersen Oracle Linux Engineering _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme