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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED 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 50025C6778C for ; Tue, 3 Jul 2018 06:56:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0A0DA20896 for ; Tue, 3 Jul 2018 06:56:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0A0DA20896 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.de 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 S1753851AbeGCG4H (ORCPT ); Tue, 3 Jul 2018 02:56:07 -0400 Received: from mx2.suse.de ([195.135.220.15]:34872 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752636AbeGCG4F (ORCPT ); Tue, 3 Jul 2018 02:56:05 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 7FBA5AE53; Tue, 3 Jul 2018 06:56:04 +0000 (UTC) Subject: Re: [RFC] scsi: switch to scsi-mq by default To: Johannes Thumshirn , "Martin K . Petersen" Cc: Christoph Hellwig , Bart Van Assche , Ming Lei , Linux Kernel Mailinglist , Linux SCSI Mailinglist References: <20180703065413.6098-1-jthumshirn@suse.de> From: Hannes Reinecke Message-ID: <32b31863-48c6-002e-e769-0c76f90502a3@suse.de> Date: Tue, 3 Jul 2018 08:56:03 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0 MIME-Version: 1.0 In-Reply-To: <20180703065413.6098-1-jthumshirn@suse.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/03/2018 08:54 AM, Johannes Thumshirn wrote: > It has been more than one year since we tried to change the default > from legacy to multi queue in SCSI. Back then we had to retract the > change because of performance issues with rotating disks. > > In the meantime there have been a substantial amount of performance > improvements, thus we can re-enable scsi-mq without a significant > performance penalty. > > Signed-off-by: Johannes Thumshirn > --- > drivers/scsi/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/drivers/scsi/Kconfig b/drivers/scsi/Kconfig > index 35c909bbf8ba..bd115bab162e 100644 > --- a/drivers/scsi/Kconfig > +++ b/drivers/scsi/Kconfig > @@ -49,6 +49,7 @@ config SCSI_NETLINK > > config SCSI_MQ_DEFAULT > bool "SCSI: use blk-mq I/O path by default" > + default y > depends on SCSI > ---help--- > This option enables the new blk-mq based I/O path for SCSI > Yeah, let's try it. Reviewed-by: Hannes Reinecke Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking hare@suse.de +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg)