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From: Bart Van Assche <bvanassche@acm.org>
To: Alan Cox <gnomes@lxorguk.ukuu.org.uk>
Cc: Paolo Valente <paolo.valente@linaro.org>,
	Jens Axboe <axboe@kernel.dk>,
	Linus Walleij <linus.walleij@linaro.org>,
	linux-block <linux-block@vger.kernel.org>,
	linux-mmc <linux-mmc@vger.kernel.org>,
	linux-mtd@lists.infradead.org, Pavel Machek <pavel@ucw.cz>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Richard Weinberger <richard@nod.at>,
	Artem Bityutskiy <dedekind1@gmail.com>,
	Adrian Hunter <adrian.hunter@intel.com>, Jan Kara <jack@suse.cz>,
	Andreas Herrmann <aherrmann@suse.com>,
	Mel Gorman <mgorman@suse.com>,
	Chunyan Zhang <zhang.chunyan@linaro.org>,
	linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] block: BFQ default for single queue devices
Date: Thu, 04 Oct 2018 13:09:06 -0700	[thread overview]
Message-ID: <1538683746.230807.9.camel@acm.org> (raw)
In-Reply-To: <20181004202553.71c2599c@alans-desktop>

On Thu, 2018-10-04 at 20:25 +0100, Alan Cox wrote:
> > 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.

Which I/O scheduler works best also depends which workload the user will run.
BFQ has significant advantages for interactive workloads like video replay
with concurrent background I/O but probably slows down kernel builds. That's
why I'm not sure whether the kernel should select the default I/O scheduler.

Bart.

  reply	other threads:[~2018-10-04 20:09 UTC|newest]

Thread overview: 104+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-02 12:43 [PATCH] block: BFQ default for single queue devices Linus Walleij
2018-10-02 12:43 ` Linus Walleij
2018-10-02 14:31 ` Jens Axboe
2018-10-02 14:31   ` Jens Axboe
2018-10-02 14:45   ` Linus Walleij
2018-10-02 14:45     ` Linus Walleij
2018-10-03  6:29   ` Paolo Valente
2018-10-03  6:29     ` Paolo Valente
2018-10-03  6:29     ` Paolo Valente
2018-10-03  6:53     ` Linus Walleij
2018-10-03 13:25       ` Jan Kara
2018-10-04  7:45         ` Johannes Thumshirn
2018-10-04  7:45           ` Johannes Thumshirn
2018-10-04  8:24           ` Andreas Herrmann
2018-10-03  7:05     ` Artem Bityutskiy
2018-10-03  7:05       ` Artem Bityutskiy
2018-10-03  7:05       ` Artem Bityutskiy
2018-10-03  7:18       ` Linus Walleij
2018-10-03  7:42         ` Damien Le Moal
2018-10-03  7:42           ` Damien Le Moal
2018-10-03  8:28           ` Linus Walleij
2018-10-03  8:53             ` Damien Le Moal
2018-10-03  8:53               ` Damien Le Moal
2018-10-03  8:53               ` Damien Le Moal
2018-10-03 15:53             ` Paolo Valente
2018-10-03 15:53               ` Paolo Valente
2018-10-03 17:34               ` Bryan Gurney
2018-10-04  8:21                 ` Linus Walleij
2018-10-04  9:56                 ` Ulf Hansson
2018-10-03 12:51           ` Christoph Hellwig
2018-10-03 12:51             ` Christoph Hellwig
2018-10-03 14:58             ` Bart Van Assche
2018-10-03 14:58               ` Bart Van Assche
2018-10-03 15:01               ` Christoph Hellwig
2018-10-03 15:01                 ` Christoph Hellwig
2018-10-03 15:15                 ` Bart Van Assche
2018-10-03 15:15                   ` Bart Van Assche
2018-10-03 15:15                   ` Bart Van Assche
2018-10-05  6:24                   ` Christoph Hellwig
2018-10-05  6:24                     ` Christoph Hellwig
2018-10-03 15:52           ` Paolo Valente
2018-10-03 15:52             ` Paolo Valente
2018-10-03 15:52             ` Paolo Valente
2018-10-03 11:49     ` Oleksandr Natalenko
2018-10-03 11:49       ` Oleksandr Natalenko
2018-10-03 11:49       ` Oleksandr Natalenko
2018-10-03 14:51       ` Mark Brown
2018-10-03 14:51         ` Mark Brown
2018-10-03 15:55       ` Paolo Valente
2018-10-03 15:55         ` Paolo Valente
2018-10-03 15:55         ` Paolo Valente
2018-10-03 16:00         ` Bart Van Assche
2018-10-03 16:00           ` Bart Van Assche
2018-10-03 16:00           ` Bart Van Assche
2018-10-03 16:04           ` Paolo Valente
2018-10-03 16:04             ` Paolo Valente
2018-10-03 16:04             ` Paolo Valente
2018-10-04  7:38         ` Jan Kara
2018-10-04  7:38           ` Jan Kara
2018-10-04  8:14       ` Linus Walleij
2018-10-04 10:13         ` Mark Brown
2018-10-04 15:10           ` Bart Van Assche
2018-10-04 15:10             ` Bart Van Assche
2018-10-04 15:26             ` Mark Brown
2018-10-05  9:49         ` Pavel Machek
2018-10-04  8:25       ` Linus Walleij
2018-10-03 15:54     ` Bart Van Assche
2018-10-03 15:54       ` Bart Van Assche
2018-10-03 15:54       ` Bart Van Assche
2018-10-03 16:02       ` Paolo Valente
2018-10-03 16:02         ` Paolo Valente
2018-10-03 16:02         ` Paolo Valente
2018-10-03 16:09         ` Paolo Valente
2018-10-03 17:22         ` Paolo Valente
2018-10-03 17:22           ` Paolo Valente
2018-10-04 19:25       ` Alan Cox
2018-10-04 19:25         ` Alan Cox
2018-10-04 20:09         ` Bart Van Assche [this message]
2018-10-04 20:39           ` Paolo Valente
2018-10-04 20:39             ` Paolo Valente
2018-10-04 22:42             ` Bart Van Assche
2018-10-05  9:16               ` Jan Kara
2018-10-06  3:12                 ` Bart Van Assche
2018-10-06  6:46                   ` Paolo Valente
2018-10-06  6:46                     ` Paolo Valente
2018-10-06  6:46                     ` Paolo Valente
2018-10-06 16:20                     ` Bart Van Assche
2018-10-06 16:20                       ` Bart Van Assche
2018-10-06 16:46                       ` Paolo Valente
2018-10-06 16:46                         ` Paolo Valente
2018-10-06 16:46                         ` Paolo Valente
2018-10-05  9:28               ` Paolo Valente
2018-10-05  9:28                 ` Paolo Valente
2018-10-05  6:24           ` Artem Bityutskiy
2018-10-05  6:24             ` Artem Bityutskiy
2018-10-04 20:19         ` Paolo Valente
2018-10-04 20:19           ` Paolo Valente
2018-10-02 21:28 ` Richard Weinberger
2018-10-02 21:28   ` Richard Weinberger
2018-10-03 15:51 ` Paolo Valente
2018-10-03 15:51   ` Paolo Valente
2018-10-03 15:51   ` Paolo Valente
2018-10-05  8:04 ` Pavel Machek
2018-10-05  8:04   ` Pavel Machek

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