From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Subject: Re: [LSF/MM TOPIC] Two blk-mq related topics To: James Bottomley , Ming Lei , lsf-pc@lists.linux-foundation.org, Linux-scsi@vger.kernel.org, linux-block@vger.kernel.org, linux-nvme@lists.infradead.org References: <20180129154455.GB17176@ming.t460p> <1517259390.3969.41.camel@HansenPartnership.com> From: Jens Axboe Message-ID: Date: Mon, 29 Jan 2018 14:00:11 -0700 MIME-Version: 1.0 In-Reply-To: <1517259390.3969.41.camel@HansenPartnership.com> Content-Type: text/plain; charset=utf-8 List-ID: On 1/29/18 1:56 PM, James Bottomley wrote: > On Mon, 2018-01-29 at 23:46 +0800, Ming Lei wrote: > [...] >> 2. When to enable SCSI_MQ at default again? > > I'm not sure there's much to discuss ... I think the basic answer is as > soon as Christoph wants to try it again. FWIW, internally I've been running various IO intensive workloads on what is essentially 4.12 upstream with scsi-mq the default (with mq-deadline as the scheduler) and comparing IO workloads with a previous 4.6 kernel (without scsi-mq), and things are looking great. We're never going to iron out the last kinks with it being off by default, I think we should attempt to flip the switch again for 4.16. -- Jens Axboe