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Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler

From Jens Axboe <axboe@kernel.dk>
Newsgroups linux.kernel
Subject Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler
Date 2016-10-26 17:40 +0200
Message-ID <swyt4-5IE-23@gated-at.bofh.it> (permalink)
References <swsH0-1Ia-9@gated-at.bofh.it> <swuIN-2Z9-7@gated-at.bofh.it> <swy9I-5BD-19@gated-at.bofh.it> <swy9I-5BD-17@gated-at.bofh.it> <swyt4-5IE-9@gated-at.bofh.it>
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On 10/26/2016 09:29 AM, Christoph Hellwig wrote:
> On Wed, Oct 26, 2016 at 05:13:07PM +0200, Arnd Bergmann wrote:
>> The question to ask first is whether to actually have pluggable
>> schedulers on blk-mq at all, or just have one that is meant to
>> do the right thing in every case (and possibly can be bypassed
>> completely).
>
> That would be my preference.  Have a BFQ-variant for blk-mq as an
> option (default to off unless opted in by the driver or user), and
> not other scheduler for blk-mq.  Don't bother with bfq for non
> blk-mq.  It's not like there is any advantage in the legacy-request
> device even for slow devices, except for the option of having I/O
> scheduling.

It's the only right way forward. blk-mq might not offer any substantial
advantages to rotating storage, but with scheduling, it won't offer a
downside either. And it'll take us towards the real goal, which is to
have just one IO path. Adding a new scheduler for the legacy IO path
makes no sense. Adding one for blk-mq and phasing out the old path is
what we need to do.

-- 
Jens Axboe

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[PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Paolo Valente <paolo.valente@linaro.org> - 2016-10-26 11:30 +0200
  [PATCH 05/14] block, bfq: add more fairness with writes and slow processes Paolo Valente <paolo.valente@linaro.org> - 2016-10-26 11:30 +0200
  [PATCH 04/14] block, bfq: modify the peak-rate estimator Paolo Valente <paolo.valente@linaro.org> - 2016-10-26 11:40 +0200
  [PATCH 03/14] block, bfq: improve throughput boosting Paolo Valente <paolo.valente@linaro.org> - 2016-10-26 11:40 +0200
  [PATCH 09/14] block, bfq: reduce latency during request-pool saturation Paolo Valente <paolo.valente@linaro.org> - 2016-10-26 11:40 +0200
  [PATCH 07/14] block, bfq: reduce I/O latency for soft real-time applications Paolo Valente <paolo.valente@linaro.org> - 2016-10-26 11:40 +0200
  Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Christoph Hellwig <hch@infradead.org> - 2016-10-26 12:30 +0200
    Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jan Kara <jack@suse.cz> - 2016-10-26 13:40 +0200
      Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Arnd Bergmann <arnd@arndb.de> - 2016-10-26 17:20 +0200
        Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Christoph Hellwig <hch@infradead.org> - 2016-10-26 17:40 +0200
          Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jens Axboe <axboe@kernel.dk> - 2016-10-26 17:40 +0200
            Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Paolo Valente <paolo.valente@linaro.org> - 2016-10-26 18:10 +0200
              Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jens Axboe <axboe@kernel.dk> - 2016-10-26 18:20 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jan Kara <jack@suse.cz> - 2016-10-27 16:10 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Grozdan <neutrino8@gmail.com> - 2016-10-27 16:40 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Heinz Diehl <htd+ml@fritha.org> - 2016-10-27 18:00 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jens Axboe <axboe@kernel.dk> - 2016-10-27 18:30 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jens Axboe <axboe@kernel.dk> - 2016-10-27 18:30 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jan Kara <jack@suse.cz> - 2016-10-28 10:00 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jens Axboe <axboe@kernel.dk> - 2016-10-28 16:20 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Ulf Hansson <ulf.hansson@linaro.org> - 2016-10-27 19:40 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jens Axboe <axboe@kernel.dk> - 2016-10-27 19:50 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Ulf Hansson <ulf.hansson@linaro.org> - 2016-10-27 20:20 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jens Axboe <axboe@kernel.dk> - 2016-10-27 20:30 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Ulf Hansson <ulf.hansson@linaro.org> - 2016-10-27 21:40 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jens Axboe <axboe@kernel.dk> - 2016-10-27 23:10 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Linus Walleij <linus.walleij@linaro.org> - 2016-10-28 00:30 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Linus Walleij <linus.walleij@linaro.org> - 2016-10-28 11:40 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jens Axboe <axboe@kernel.dk> - 2016-10-28 16:30 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Linus Walleij <linus.walleij@linaro.org> - 2016-10-28 22:40 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Christoph Hellwig <hch@infradead.org> - 2016-10-28 17:30 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Linus Walleij <linus.walleij@linaro.org> - 2016-10-28 23:10 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jens Axboe <axboe@kernel.dk> - 2016-10-28 17:40 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com> - 2016-10-28 18:00 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Arnd Bergmann <arnd@arndb.de> - 2016-10-28 18:10 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Mark Brown <broonie@kernel.org> - 2016-10-28 19:20 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jens Axboe <axboe@kernel.dk> - 2016-10-28 16:10 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Ulf Hansson <ulf.hansson@linaro.org> - 2016-10-28 08:40 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jens Axboe <axboe@kernel.dk> - 2016-10-28 16:20 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Mark Brown <broonie@kernel.org> - 2016-10-28 19:20 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Christoph Hellwig <hch@infradead.org> - 2016-10-27 21:50 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Mark Brown <broonie@kernel.org> - 2016-10-28 00:10 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Mark Brown <broonie@kernel.org> - 2016-10-27 21:50 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Arnd Bergmann <arnd@arndb.de> - 2016-10-28 14:10 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Richard Weinberger <richard.weinberger@gmail.com> - 2016-10-28 14:20 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Paolo Valente <paolo.valente@linaro.org> - 2016-10-29 07:40 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Bart Van Assche <Bart.VanAssche@sandisk.com> - 2016-10-29 15:20 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra  scheduler Jens Axboe <axboe@kernel.dk> - 2016-10-29 16:20 +0200
                Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Paolo Valente <paolo.valente@linaro.org> - 2016-10-30 04:10 +0100
    Re: [PATCH 00/14] introduce the BFQ-v0 I/O scheduler as an extra scheduler Paolo Valente <paolo.valente@linaro.org> - 2016-10-26 14:50 +0200

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