Re: [PATCH V3 00/11] block-throttle: add .high limit

From	Tejun Heo <tj@kernel.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH V3 00/11] block-throttle: add .high limit
Date	2016-10-04 18:30 +0200
Message-ID	<soALn-5bt-13@gated-at.bofh.it> (permalink)
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Hello,

On Tue, Oct 04, 2016 at 06:22:28PM +0200, Paolo Valente wrote:
> Could you please elaborate more on this point?  BFQ uses sectors
> served to measure service, and, on the all the fast devices on which
> we have tested it, it accurately distributes
> bandwidth as desired, redistributes excess bandwidth with any issue,
> and guarantees high responsiveness and low latency at application and
> system level (e.g., ~0 drop rate in video playback, with any background
> workload tested).

The same argument as before.  Bandwidth is a very bad measure of IO
resources spent.  For specific use cases (like desktop or whatever),
this can work but not generally.

> Could you please suggest me some test to show how sector-based
> guarantees fails?

Well, mix 4k random and sequential workloads and try to distribute the
acteual IO resources.

Thanks.

-- 
tejun

Thread

[PATCH V3 00/11] block-throttle: add .high limit Shaohua Li <shli@fb.com> - 2016-10-03 23:30 +0200
  [PATCH v3 10/11] block-throttle: add a simple idle detection Shaohua Li <shli@fb.com> - 2016-10-03 23:30 +0200
  [PATCH v3 07/11] blk-throttle: make throtl_slice tunable Shaohua Li <shli@fb.com> - 2016-10-03 23:30 +0200
  [PATCH v3 08/11] blk-throttle: detect completed idle cgroup Shaohua Li <shli@fb.com> - 2016-10-03 23:30 +0200
  [PATCH v3 06/11] blk-throttle: make sure expire time isn't too big Shaohua Li <shli@fb.com> - 2016-10-03 23:30 +0200
  [PATCH v3 11/11] blk-throttle: ignore idle cgroup limit Shaohua Li <shli@fb.com> - 2016-10-03 23:30 +0200
  [PATCH v3 09/11] block-throttle: make bandwidth change smooth Shaohua Li <shli@fb.com> - 2016-10-03 23:30 +0200
  [PATCH v3 03/11] block-throttle: configure bps/iops limit for cgroup in high limit Shaohua Li <shli@fb.com> - 2016-10-03 23:30 +0200
  [PATCH v3 01/11] block-throttle: prepare support multiple limits Shaohua Li <shli@fb.com> - 2016-10-03 23:30 +0200
  [PATCH v3 02/11] block-throttle: add .high interface Shaohua Li <shli@fb.com> - 2016-10-03 23:30 +0200
  Re: [PATCH V3 00/11] block-throttle: add .high limit Vivek Goyal <vgoyal@redhat.com> - 2016-10-04 15:30 +0200
    Re: [PATCH V3 00/11] block-throttle: add .high limit Tejun Heo <tj@kernel.org> - 2016-10-04 18:00 +0200
      Re: [PATCH V3 00/11] block-throttle: add .high limit Tejun Heo <tj@kernel.org> - 2016-10-04 18:30 +0200
        Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-04 19:10 +0200
          Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-04 19:50 +0200
            Re: [PATCH V3 00/11] block-throttle: add .high limit Tejun Heo <tj@kernel.org> - 2016-10-04 21:00 +0200
              Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-04 21:10 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Tejun Heo <tj@kernel.org> - 2016-10-04 21:20 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-04 21:40 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Tejun Heo <tj@kernel.org> - 2016-10-04 22:30 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-05 14:40 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Vivek Goyal <vgoyal@redhat.com> - 2016-10-05 15:20 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-05 16:10 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Tejun Heo <tj@kernel.org> - 2016-10-05 17:00 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-05 21:50 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-05 22:10 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-06 10:00 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-06 15:20 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Vivek Goyal <vgoyal@redhat.com> - 2016-10-06 19:50 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-06 20:10 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Vivek Goyal <vgoyal@redhat.com> - 2016-10-06 20:40 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-06 23:00 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Mark Brown <broonie@kernel.org> - 2016-10-06 21:50 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-07 00:30 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-05 22:00 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-06 09:30 +0200
                Fwd: [PATCH V3 00/11] block-throttle: add .high limit Kyle Sanderson <kyle.leet@gmail.com> - 2016-10-09 03:20 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Linus Walleij <linus.walleij@linaro.org> - 2016-10-06 10:10 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Mark Brown <broonie@kernel.org> - 2016-10-06 13:10 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2016-10-06 14:00 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-06 15:00 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2016-10-06 16:00 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-06 17:10 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit "Austin S. Hemmelgarn" <ahferroin7@gmail.com> - 2016-10-06 17:20 +0200
                Re: [PATCH V3 00/11] block-throttle: add .high limit Heinz Diehl <htd+ml@fritha.org> - 2016-10-08 12:50 +0200
            Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-04 21:50 +0200
      Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-04 18:30 +0200
      Re: [PATCH V3 00/11] block-throttle: add .high limit Vivek Goyal <vgoyal@redhat.com> - 2016-10-04 20:20 +0200
        Re: [PATCH V3 00/11] block-throttle: add .high limit Tejun Heo <tj@kernel.org> - 2016-10-04 21:00 +0200
          Re: [PATCH V3 00/11] block-throttle: add .high limit Paolo Valente <paolo.valente@unimore.it> - 2016-10-04 21:00 +0200

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