From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adrian Hunter Subject: Re: [PATCH] scsi: switch to scsi-mq by default Date: Wed, 11 Jul 2018 11:31:37 +0300 Message-ID: <6cf082e4-6fff-21dd-4df5-a6e9e4f2847c@intel.com> References: <20180704085356.10888-1-jthumshirn@suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org To: "Martin K. Petersen" , Johannes Thumshirn Cc: Hannes Reinecke , Bart Van Assche , Ming Lei , Linux SCSI Mailinglist , Linux Kernel Mailinglist List-Id: linux-scsi@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.