From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, T_DKIMWL_WL_HIGH,UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26C08C5CFE7 for ; Wed, 11 Jul 2018 02:52:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id CF8A220936 for ; Wed, 11 Jul 2018 02:52:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="Qs7/PCOE" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CF8A220936 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732480AbeGKCyf (ORCPT ); Tue, 10 Jul 2018 22:54:35 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:41868 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732389AbeGKCye (ORCPT ); Tue, 10 Jul 2018 22:54:34 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.22/8.16.0.22) with SMTP id w6B2iACk007554; Wed, 11 Jul 2018 02:52:26 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=to : cc : subject : from : references : date : in-reply-to : message-id : mime-version : content-type; s=corp-2018-07-02; bh=iEkw6nbj4lNNSNtIp6hF8Qm5+SoqMiW1lgqR3d+h3qI=; b=Qs7/PCOE8mk9f4q2VNUmRmVLkAQd37uvNS9oFY66Z8cIMb7JYqB9kX/Iq0okZKKijhAw CmZ2maXA1Y8r4RsnBl5GjCUsMog/gwyEgxAIbF6QJW3LMRgOgvjs3OP6Vj/bKdLlVwaF xJ8D2B7u6nSPogWXn9y5KgD15K8rA0LXVIlFv8N5O6Q600XorWVp+IDl6yb0zYkLYLEK LZVMA+IHQH2vY+o2e/5C6sEzlbTfkVfaZWJn7FuJs1XlnGgTHOJnz7ByHM1ZL0iQ2tBG /hm4fGW1yr59S3Bl0r+KacQ/hIQ9B8vwYGLVoHcY7zqgk07ucDFaKd6MxbYgLWZsS9z8 ug== Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp2130.oracle.com with ESMTP id 2k2p764c1j-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 11 Jul 2018 02:52:26 +0000 Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by aserv0021.oracle.com (8.14.4/8.14.4) with ESMTP id w6B2qP5v026047 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 11 Jul 2018 02:52:25 GMT Received: from abhmp0006.oracle.com (abhmp0006.oracle.com [141.146.116.12]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id w6B2qOOJ017749; Wed, 11 Jul 2018 02:52:24 GMT Received: from ca-mkp.ca.oracle.com (/10.159.214.123) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Tue, 10 Jul 2018 19:52:24 -0700 To: Johannes Thumshirn Cc: "Martin K . Petersen" , Hannes Reinecke , Bart Van Assche , Ming Lei , Linux SCSI Mailinglist , Linux Kernel Mailinglist Subject: Re: [PATCH] scsi: switch to scsi-mq by default From: "Martin K. Petersen" Organization: Oracle Corporation References: <20180704085356.10888-1-jthumshirn@suse.de> Date: Tue, 10 Jul 2018 22:52:21 -0400 In-Reply-To: <20180704085356.10888-1-jthumshirn@suse.de> (Johannes Thumshirn's message of "Wed, 4 Jul 2018 10:53:56 +0200") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.3 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=8950 signatures=668706 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=408 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1806210000 definitions=main-1807110026 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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! -- Martin K. Petersen Oracle Linux Engineering