linux-kernel - Re: [PATCH] block: BFQ default for single queue devices

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Message-ID: <CACRpkdbHD4fNq0jz_JBuake7piJwRJmiK_JtsMXkiWVWxnis8A@mail.gmail.com>
Date:   Thu, 4 Oct 2018 10:21:11 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     bgurney@...hat.com
Cc:     Paolo Valente <paolo.valente@...aro.org>, Damien.LeMoal@....com,
        Artem Bityutskiy <dedekind1@...il.com>,
        Jens Axboe <axboe@...nel.dk>,
        linux-block <linux-block@...r.kernel.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        linux-mtd@...ts.infradead.org, Pavel Machek <pavel@....cz>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Richard Weinberger <richard@....at>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jan Kara <jack@...e.cz>, aherrmann@...e.com, mgorman@...e.com,
        Chunyan Zhang <zhang.chunyan@...aro.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        bfq-iosched@...glegroups.com, oleksandr@...alenko.name,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH] block: BFQ default for single queue devices

On Wed, Oct 3, 2018 at 7:34 PM Bryan Gurney <bgurney@...hat.com> wrote:

> Right now, users of host-managed SMR drives should be using "deadline"
> or "mq-deadline", to avoid out-of-order writes in sequential-only
> zones.
>
> I'm running into a situation right now on a test system (Fedora 28,
> 4.18.7 kernel) where I copied test data onto an F2FS filesystem, but I
> accidentally forgot to add my "udev rule" file:

This should be fixed after
d5038a13eca7 scsi: core: switch to scsi-mq by default
right?

Since mq use mq-deadline by default.

I'm making sure to preserve mq-deadline on zoned devices
in my v2 of this patch.

Yours,
Linus Walleij