Received: by 2002:ac0:a5a7:0:0:0:0:0 with SMTP id m36-v6csp249461imm; Wed, 11 Jul 2018 01:34:10 -0700 (PDT) X-Google-Smtp-Source: AAOMgpe96pNWI4qatTICQY0zayfaCwhpQYQ9AKJp/649d6kUlAlsPl++J3BToi3IcorKi+xpWWCT X-Received: by 2002:a65:5686:: with SMTP id v6-v6mr25877504pgs.141.1531298050565; Wed, 11 Jul 2018 01:34:10 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1531298050; cv=none; d=google.com; s=arc-20160816; b=0FnBI3DVo6/obBOEmPEZhlHSe48DmrFyq6ncGI0306+tppS6sthZmRiEcMWTMhDN3D w0IZv+4/hoNm34cMhh/XSfaGTdUorBKLMXwh9hjd7ev7nPQ/JU8hOaQmsyymulV4j4tU fWd4u3gozbTsJabzMsPW4/HCyccfhwtwFKNYo6vr5H083lnZmV4SmfyTyerkFFMbAAxB lDIozvjroUL81Fq+KinO4unmM1rVPdGF7pDw4WWJyhpgI50oZTd8bVINYP7fXjeeXkRU yW6cCPQHes91FHiTFpMAx+J4abR393zSfCg2ThC//GXLhtuoA++7NEw2sPtDJk1wKk95 rSJQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding :content-language:in-reply-to:mime-version:user-agent:date :message-id:organization:from:references:cc:to:subject :arc-authentication-results; bh=O7C/0gKvz3HT9RkM7TfsC2DL2Q+1/D6ucMzyPOAtY7A=; b=CODJU6i4Jppn6+zJZ4FEvj+g95jiR4zVhqqNF6mNBI0HH3R2qHj+Jjo4RgEPpG3ER+ vevUmliaQwLniQYARhW4Uqblm02tZT8IxaVhrX7NU/JDr/quHWqAhDtwwpSeg6j7RuqC rgYthGm5XrwtdPAaZt8pd+SyLk+f2ZnPbSCaMw9dimtiVXTbpvolGXYlWVacq4m8Bl2Z MPSeDzzL9MDiIoaZEy8jXY+disRf+ZYEzZAOBtd9dOQa2ghA3Nl34x99B7yyautxBerU wxjsWMsNIWg5OvdVj+W5BnfFFYHSSfxGcKWjc4fX1v2g7DlZZodNJG3Js/G+2Ck22pDx A7nw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id p10-v6si13976317pgm.265.2018.07.11.01.33.55; Wed, 11 Jul 2018 01:34:10 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732419AbeGKIgV (ORCPT + 99 others); Wed, 11 Jul 2018 04:36:21 -0400 Received: from mga18.intel.com ([134.134.136.126]:44849 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726280AbeGKIgV (ORCPT ); Wed, 11 Jul 2018 04:36:21 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga106.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Jul 2018 01:33:11 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,337,1526367600"; d="scan'208";a="56011731" Received: from ahunter-desktop.fi.intel.com (HELO [10.237.72.168]) ([10.237.72.168]) by orsmga008.jf.intel.com with ESMTP; 11 Jul 2018 01:33:09 -0700 Subject: Re: [PATCH] scsi: switch to scsi-mq by default To: "Martin K. Petersen" , Johannes Thumshirn Cc: Hannes Reinecke , Bart Van Assche , Ming Lei , Linux SCSI Mailinglist , Linux Kernel Mailinglist References: <20180704085356.10888-1-jthumshirn@suse.de> From: Adrian Hunter Organization: Intel Finland Oy, Registered Address: PL 281, 00181 Helsinki, Business Identity Code: 0357606 - 4, Domiciled in Helsinki Message-ID: <6cf082e4-6fff-21dd-4df5-a6e9e4f2847c@intel.com> Date: Wed, 11 Jul 2018 11:31:37 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 11/07/18 05:52, Martin K. Petersen wrote: > > Johannes, > >> It has been more than one year since we tried to change the default >> from legacy to multi queue in SCSI with commit c279bd9e406 ("scsi: >> default to scsi-mq"). But due to issues with suspend/resume and >> performance problems it had been reverted again with commit >> cbe7dfa26eee ("Revert "scsi: default to scsi-mq""). >> >> In the meantime there have been a substantial amount of performance >> improvements and suspend/resume got fixed as well, thus we can >> re-enable scsi-mq without a significant performance penalty. > > Applied to 4.19/scsi-queue, thanks! > But there is no runtime pm support, is there? I tried enabling runtime PM for UFS SCSI devices with scsi-mq and it didn't work, which is a regression.