linux-kernel - Re: [PATCH V4 00/15] blk-throttle: add .high limit

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Message-ID: <20161115213108.GA28069@shli-mbp.local>
Date:   Tue, 15 Nov 2016 13:31:10 -0800
From:   Shaohua Li <shli@...com>
To:     Bart Van Assche <bart.vanassche@...disk.com>
CC:     "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Kernel-team@...com" <Kernel-team@...com>,
        "axboe@...com" <axboe@...com>, "tj@...nel.org" <tj@...nel.org>,
        "vgoyal@...hat.com" <vgoyal@...hat.com>
Subject: Re: [PATCH V4 00/15] blk-throttle: add .high limit

On Tue, Nov 15, 2016 at 11:53:39AM -0800, Bart Van Assche wrote:
> On 11/14/2016 05:28 PM, Shaohua Li wrote:
> > On Mon, Nov 14, 2016 at 05:18:28PM -0800, Bart Van Assche wrote:
> > > Unless someone can convince me of the opposite I think that coming up with
> > > an algorithm for estimating I/O cost is essential to guarantee I/O fairness
> > > without requesting users to perform complicated parameter configurations.
> > 
> > That's what I tried before:
> > http://marc.info/?l=linux-kernel&m=145617863208940&w=2
> 
> That URL refers to v2 of this patch series. Sorry but I have not found the
> I/O cost estimation algorithm I was referring to in v2 of this patch series.

It's a v2, but not the v2 of this series. There is no algorithm to estimate I/O
cost, that one just uses IOPS or bandwidth to determine I/O cost.

Thanks,
Shaohua