Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752766AbaKCBTp (ORCPT ); Sun, 2 Nov 2014 20:19:45 -0500 Received: from mx0a-00082601.pphosted.com ([67.231.145.42]:15511 "EHLO mx0a-00082601.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751648AbaKCBTn (ORCPT ); Sun, 2 Nov 2014 20:19:43 -0500 Message-ID: <5456D7F5.10308@fb.com> Date: Sun, 2 Nov 2014 18:18:45 -0700 From: Jens Axboe User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0 MIME-Version: 1.0 To: Ezequiel Garcia , Richard Weinberger , , CC: , , , Subject: Re: [PATCH] UBI: Block: Add blk-mq support References: <1414933255-3795-1-git-send-email-richard@nod.at> <5456A787.5060104@free-electrons.com> In-Reply-To: <5456A787.5060104@free-electrons.com> Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [192.168.57.29] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.12.52,1.0.28,0.0.0000 definitions=2014-11-03_01:2014-10-31,2014-11-02,1970-01-01 signatures=0 X-Proofpoint-Spam-Details: rule=fb_default_notspam policy=fb_default score=0 kscore.is_bulkscore=0 kscore.compositescore=0 circleOfTrustscore=0 compositescore=0.160988131301636 urlsuspect_oldscore=0.160988131301636 suspectscore=0 recipient_domain_to_sender_totalscore=0 phishscore=0 bulkscore=0 kscore.is_spamscore=0 recipient_to_sender_totalscore=0 recipient_domain_to_sender_domain_totalscore=1996008 rbsscore=0.160988131301636 spamscore=0 recipient_to_sender_domain_totalscore=4 urlsuspectscore=0.9 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=7.0.1-1402240000 definitions=main-1411030012 X-FB-Internal: deliver Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2014-11-02 14:52, Ezequiel Garcia wrote: > Hi Richard, > > On 11/02/2014 10:00 AM, Richard Weinberger wrote: >> Convert the driver to blk-mq. >> > > Maybe you can explain a bit better what's this all about? > > Both the commit that introduces blk-mq and the paper on it talk about > high IOPS devices, multi-core, NUMA systems. I'm not sure this is the > case for UBI-based devices. The goal of blk-mq was to solve the issues around those systems, while at the same time provide a more modern infrastructure in general. It was never the intent to make blk-mq exclusive to higher end systems or devices, in fact quite the opposite. The goal is to slowly deprecate the old IO stack and switch everything (as far as we can) to blk-mq. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/