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Re: [GIT PULL] Block pull request for- 4.11-rc1

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On 02/22/2017 11:56 AM, Linus Torvalds wrote:
> On Wed, Feb 22, 2017 at 10:52 AM, Jens Axboe <axboe@kernel.dk> wrote:
>>>
>>> It's that simple.
>>
>> No, it's not that simple at all. Fact is, some optimizations make sense
>> for some workloads, and some do not.
> 
> Are you even listening?
> 
> I'm saying no user can ever give a sane answer to your question. The
> question is insane and wrong.
> 
> I already said you can have a dynamic configuration (and maybe even an
> automatic heuristic - like saying that a ramdisk gets NOOP by default,
> real hardware does not).
> 
> But asking a user at kernel config time for a default is insane. If
> *you* cannot answer it, then the user sure as hell cannot.
> 
> Other configuration questions have problems too, but at least the
> question about "should I support ext4" is something a user (or distro)
> can sanely answer. So your comparisons are pure bullshit.

As per the previous email, this was my proposed solution:

OK, so here's what I'll do:

1) We'll kill the default scheduler choices. sq blk-mq will default to
   mq-deadline, mq blk-mq will default to "none" (at least for now, until
   the new scheduler is done).
2) The individual schedulers will be y/m/n selectable, just like any
   other driver.

Any further settings on that can be done at runtime, through sysfs.

-- 
Jens Axboe

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[GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-20 01:20 +0100
  Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-20 02:20 +0100
    Re: [GIT PULL] Block pull request for- 4.11-rc1 James Bottomley <James.Bottomley@HansenPartnership.com> - 2017-02-20 03:20 +0100
      Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-20 04:10 +0100
        Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-20 04:10 +0100
    Re: [GIT PULL] Block pull request for- 4.11-rc1 Christoph Hellwig <hch@lst.de> - 2017-02-20 08:40 +0100
      Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-20 17:40 +0100
        Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-24 19:00 +0100
        Re: [GIT PULL] Block pull request for- 4.11-rc1 Linus Torvalds <torvalds@linux-foundation.org> - 2017-02-24 21:00 +0100
          Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-24 21:10 +0100
            Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-24 21:30 +0100
              Re: [GIT PULL] Block pull request for- 4.11-rc1 "hch@lst.de" <hch@lst.de> - 2017-02-25 19:20 +0100
                Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-25 19:30 +0100
  Re: [GIT PULL] Block pull request for- 4.11-rc1 Linus Torvalds <torvalds@linux-foundation.org> - 2017-02-21 20:20 +0100
    Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-21 20:40 +0100
    Re: [GIT PULL] Block pull request for- 4.11-rc1 Linus Torvalds <torvalds@linux-foundation.org> - 2017-02-22 00:10 +0100
      Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-22 00:20 +0100
        Re: [GIT PULL] Block pull request for- 4.11-rc1 Linus Torvalds <torvalds@linux-foundation.org> - 2017-02-22 00:30 +0100
          Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-22 19:20 +0100
            Re: [GIT PULL] Block pull request for- 4.11-rc1 Linus Torvalds <torvalds@linux-foundation.org> - 2017-02-22 19:30 +0100
              Re: [GIT PULL] Block pull request for- 4.11-rc1 Linus Torvalds <torvalds@linux-foundation.org> - 2017-02-22 19:50 +0100
                Re: [GIT PULL] Block pull request for- 4.11-rc1 Linus Torvalds <torvalds@linux-foundation.org> - 2017-02-22 20:00 +0100
                Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-22 20:00 +0100
                Re: [GIT PULL] Block pull request for- 4.11-rc1 Linus Torvalds <torvalds@linux-foundation.org> - 2017-02-22 20:20 +0100
                Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-22 22:40 +0100
                Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-22 20:00 +0100
              Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-22 19:50 +0100
                Re: [GIT PULL] Block pull request for- 4.11-rc1 Markus Trippelsdorf <markus@trippelsdorf.de> - 2017-02-22 23:00 +0100
                Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-22 23:00 +0100
                Re: [GIT PULL] Block pull request for- 4.11-rc1 Linus Torvalds <torvalds@linux-foundation.org> - 2017-02-23 01:20 +0100
              Re: [GIT PULL] Block pull request for- 4.11-rc1 Linus Torvalds <torvalds@linux-foundation.org> - 2017-02-22 19:50 +0100
              Re: [GIT PULL] Block pull request for- 4.11-rc1 Jens Axboe <axboe@kernel.dk> - 2017-02-22 19:50 +0100

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