From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Subject: Re: [PATCH] block: BFQ default for single queue devices
Date: Thu, 4 Oct 2018 20:25:53 +0100
Message-ID: <20181004202553.71c2599c@alans-desktop>
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To: Bart Van Assche <bvanassche@acm.org>
Cc: Jens Axboe <axboe@kernel.dk>, Andreas Herrmann <aherrmann@suse.com>, Ulf Hansson <ulf.hansson@linaro.org>, Paolo Valente <paolo.valente@linaro.org>, Jan Kara <jack@suse.cz>, Mel Gorman <mgorman@suse.com>, Artem Bityutskiy <dedekind1@gmail.com>, Richard Weinberger <richard@nod.at>, Linus Walleij <linus.walleij@linaro.org>, linux-mmc <linux-mmc@vger.kernel.org>, Adrian Hunter <adrian.hunter@intel.com>, Chunyan Zhang <zhang.chunyan@linaro.org>, linux-block <linux-block@vger.kernel.org>, "'Paolo Valente' via bfq-iosched\"        
 <bfq-iosched@googlegroups.com>, Oleksandr Natalenko
 <oleksandr@natalenko.name>, Mark Brown <broonie@kernel.org>"@fuzix.org, linux-mtd@lists.infradead.org, Pavel Machek <pavel@ucw.cz>, linux-kernel <linux-kernel@vger.kernel.org>
List-Id: linux-mmc@vger.kernel.org

> I agree with Jens that it's best to leave it to the Linux distributors to
> select a default I/O scheduler.

That assumes such a thing exists. The kernel knows what devices it is
dealing with. The kernel 'default' ought to be 'whatever is usually best
for this device'. A distro cannot just pick a correct single default
because NVME and USB sticks are both normal and rather different in needs.

Alan

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