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

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Message-ID: <20161006194415.bpl5zylqmgy4izyc@sirena.org.uk>
Date:   Thu, 6 Oct 2016 21:44:15 +0200
From:   Mark Brown <broonie@...nel.org>
To:     Vivek Goyal <vgoyal@...hat.com>
Cc:     Paolo Valente <paolo.valente@...more.it>, Shaohua Li <shli@...com>,
        Tejun Heo <tj@...nel.org>, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jens Axboe <axboe@...com>,
        Kernel-team@...com, jmoyer@...hat.com,
        Linus Walleij <linus.walleij@...aro.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH V3 00/11] block-throttle: add .high limit

On Thu, Oct 06, 2016 at 01:49:43PM -0400, Vivek Goyal wrote:

> Paolo, CFQ is legacy now and if we can come up with a proportional
> IO mechanism which works reasonably well with fast devices using
> blk-mq interfaces, that will be much more interesting.

CFQ is not legacy yet.  Until we've got scheduling in blk-mq and
converted all the existing users over to blk-mq it's still going
to be something that affects real, production systems that don't
have any other meaningful option.

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