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Petersen" , linux-scsi@vger.kernel.org, Kashyap Desai , Sumit Saxena , Kiran Kumar Kasturi , Sankar Patra , Sasikumar PC , Shivasharan Srikanteshwara , Anand Lodnoor Subject: Re: [PATCH] megaraid_sas: change sdev queue depth max vs optimal From: "Martin K. Petersen" Organization: Oracle Corporation References: <20190726073214.23820-1-chandrakanth.patil@broadcom.com> <06139ab3efab799a9d3148b1f04847b0@mail.gmail.com> Date: Mon, 12 Aug 2019 21:52:57 -0400 In-Reply-To: <06139ab3efab799a9d3148b1f04847b0@mail.gmail.com> (Chandrakanth Patil's message of "Thu, 8 Aug 2019 22:56:56 +0530") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.92 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9347 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=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908130017 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9347 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=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1908130017 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Chandrakanth, > The firmware provided queue depth provides optimum performance in most > of the cases/workloads. And this patch provides the option to the user > to go with max queue_depth or with optimum queue_depth. I guess I'm just objecting to the notion that something is being described as "optimum" when it clearly isn't. Applied to 5.4/scsi-queue. Thanks! -- Martin K. Petersen Oracle Linux Engineering