linux-kernel - Re: [PATCH V4 09/15] blk-throttle: make bandwidth change smooth

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Message-ID: <20161124005957.GA4724@ksenks-mbp.dhcp.thefacebook.com>
Date:   Wed, 23 Nov 2016 16:59:58 -0800
From:   Shaohua Li <shli@...com>
To:     Tejun Heo <tj@...nel.org>
CC:     <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <Kernel-team@...com>, <axboe@...com>, <vgoyal@...hat.com>
Subject: Re: [PATCH V4 09/15] blk-throttle: make bandwidth change smooth

On Wed, Nov 23, 2016 at 04:23:35PM -0500, Tejun Heo wrote:
> Hello,
> 
> On Mon, Nov 14, 2016 at 02:22:16PM -0800, Shaohua Li wrote:
> > cg1/cg2 bps: 10/80 -> 15/105 -> 20/100 -> 25/95 -> 30/90 -> 35/85 -> 40/80
> > -> 45/75 -> 10/80
> 
> I wonder whether it'd make sense to make the clamping down gradual too
> (way faster than the ramping up but still gradual).  The control model
> isn't immediate anyway and doing the other direction gradually too
> might not hurt the overall control accuracy all that much.

Sure, that's in my todo list. Part of the reason is I didn't figure out an easy
to do it. I'll keep trying later.

Thanks,
Shaohua