linux-kernel - Re: [PATCH] block: Make CFQ default to IOPS mode on SSDs

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Message-ID: <87y4jsjc47.fsf@orebokech.com>
Date:	Wed, 10 Jun 2015 08:44:56 +0200
From:	Romain Francoise <romain@...bokech.com>
To:	Jens Axboe <axboe@...nel.dk>
Cc:	Tahsin Erdogan <tahsin@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: Make CFQ default to IOPS mode on SSDs

Hi,

On Tue, Jun 09, 2015 at 11:42:29AM -0600, Jens Axboe wrote:
> There are a few options to handle this. The attached might work, not
> tested at all. Basically it adds an io sched registration hook, that is
> called when we are adding the disk on the queue. Non-rotational
> detection should be done at that point.
>
> Does that work for you?

Yep, that works perfectly in my (admittedly limited) testing; slice_idle
is correctly set to 0 on non-rotational devices and keeps its default
value of 8 otherwise. Feel free to add my Tested-by.

Thanks!
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