From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Return-Path: Message-ID: <1539615735.129692.3.camel@acm.org> Subject: Re: [PATCH v2] block: BFQ default for single queue devices From: Bart Van Assche To: Linus Walleij , linux-block@vger.kernel.org, Jens Axboe Cc: linux-mmc@vger.kernel.org, linux-mtd@lists.infradead.org, Pavel Machek , Paolo Valente , Ulf Hansson , Richard Weinberger , Adrian Hunter , Jan Kara , Artem Bityutskiy , Christoph Hellwig , Alan Cox , Mark Brown , Damien Le Moal , Johannes Thumshirn , Oleksandr Natalenko , Jonathan Corbet Date: Mon, 15 Oct 2018 08:02:15 -0700 In-Reply-To: <20181015141059.26579-1-linus.walleij@linaro.org> References: <20181015141059.26579-1-linus.walleij@linaro.org> Content-Type: text/plain; charset="UTF-7" Mime-Version: 1.0 List-ID: On Mon, 2018-10-15 at 16:10 +-0200, Linus Walleij wrote: +AD4 +- +ACo For blk-mq devices, we default to using: +AD4 +- +ACo - +ACI-none+ACI for multiqueue devices (nr+AF8-hw+AF8-queues +ACEAPQ 1) +AD4 +- +ACo - +ACI-bfq+ACI, if available, for single queue devices +AD4 +- +ACo - +ACI-mq-deadline+ACI if +ACI-bfq+ACI is not available for single queue devices +AD4 +- +ACo - +ACI-none+ACI for single queue devices as well as last resort For SATA SSDs nr+AF8-hw+AF8-queues +AD0APQ 1 so this patch will also affect these SSDs. Since this patch is an attempt to improve performance, I'd like to see measurement data for one or more recent SATA SSDs before a decision is taken about what to do with this patch. Thanks, Bart. From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bart Van Assche Subject: Re: [PATCH v2] block: BFQ default for single queue devices Date: Mon, 15 Oct 2018 08:02:15 -0700 Message-ID: <1539615735.129692.3.camel@acm.org> References: <20181015141059.26579-1-linus.walleij@linaro.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20181015141059.26579-1-linus.walleij@linaro.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-mtd" Errors-To: linux-mtd-bounces+gldm-linux-mtd-36=gmane.org@lists.infradead.org To: Linus Walleij , linux-block@vger.kernel.org, Jens Axboe Cc: Alan Cox , Ulf Hansson , Paolo Valente , Jan Kara , Artem Bityutskiy , Richard Weinberger , Jonathan Corbet , linux-mmc@vger.kernel.org, Adrian Hunter , Oleksandr Natalenko , Christoph Hellwig , Mark Brown , linux-mtd@lists.infradead.org, Pavel Machek , Johannes Thumshirn , Damien Le Moal List-Id: linux-mmc@vger.kernel.org On Mon, 2018-10-15 at 16:10 +0200, Linus Walleij wrote: > + * For blk-mq devices, we default to using: > + * - "none" for multiqueue devices (nr_hw_queues != 1) > + * - "bfq", if available, for single queue devices > + * - "mq-deadline" if "bfq" is not available for single queue devices > + * - "none" for single queue devices as well as last resort For SATA SSDs nr_hw_queues == 1 so this patch will also affect these SSDs. Since this patch is an attempt to improve performance, I'd like to see measurement data for one or more recent SATA SSDs before a decision is taken about what to do with this patch. Thanks, Bart. ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/