From: Linus Walleij <linus.walleij@linaro.org>
To: Paolo Valente <paolo.valente@linaro.org>,
Johannes Thumshirn <jthumshirn@suse.de>,
aherrmann@suse.com
Cc: Jens Axboe <axboe@kernel.dk>,
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>,
mgorman@suse.com, Chunyan Zhang <zhang.chunyan@linaro.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
bfq-iosched@googlegroups.com, oleksandr@natalenko.name,
Mark Brown <broonie@kernel.org>
Subject: Re: [PATCH] block: BFQ default for single queue devices
Date: Wed, 3 Oct 2018 08:53:37 +0200 [thread overview]
Message-ID: <CACRpkdaeYU+Crr75T49WftyOHqCrsyBLBPDBBsJF-RCjmAQEdw@mail.gmail.com> (raw)
In-Reply-To: <B5321A64-8A1A-42FF-A337-F4524BDA179B@linaro.org>
On Wed, Oct 3, 2018 at 8:29 AM Paolo Valente <paolo.valente@linaro.org> wrote:
> So, I do understand your need for conservativeness, but, after so much
> evidence on single-queue devices, and so many years! :), what's the
> point in keeping Linux worse for virtually everybody, by default?
I understand if we need to ease things in as well, I don't intend this
change for the current merge window or anything, since v4.19
will notably have this patch:
commit d5038a13eca72fb216c07eb717169092e92284f1
Author: Johannes Thumshirn <jthumshirn@suse.de>
Date: Wed Jul 4 10:53:56 2018 +0200
scsi: core: switch to scsi-mq by default
It has been more than one year since we tried to change the default from
legacy to multi queue in SCSI with commit c279bd9e406 ("scsi: default to
scsi-mq"). But due to issues with suspend/resume and performance problems
it had been reverted again with commit cbe7dfa26eee ("Revert "scsi: default
to scsi-mq"").
In the meantime there have been a substantial amount of performance
improvements and suspend/resume got fixed as well, thus we can re-enable
scsi-mq without a significant performance penalty.
Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Acked-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
I guess that patch can be a bit scary by itself. But IIUC it all went
fine this time!
But hey, if that works, that means $SUBJECT patch will enable BFQ on all
libata devices and any SCSI that is single queue as well, not just
"obscure" stuff like MMC/SD and UBI, and that is
indeed a massive crowd of legacy devices. But we're talking
v4.21 here.
Johannes, you might be interested in $SUBJECT patch.
It'd be nice to hear what SUSE people have to add, since they
are pretty proactive in this area.
Yours,
Linus Walleij
next prev parent reply other threads:[~2018-10-03 6:53 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 [this message]
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
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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