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

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Date:	Wed, 10 Jun 2015 08:03:55 -0600
From:	Jens Axboe <axboe@...nel.dk>
To:	Romain Francoise <romain@...bokech.com>
CC:	Tahsin Erdogan <tahsin@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] block: Make CFQ default to IOPS mode on SSDs

On 06/10/2015 12:44 AM, Romain Francoise wrote:
> 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!

Thanks for testing, it is now committed.

-- 
Jens Axboe

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