linux-ext4 - Re: which IO-scheduler is best for flash based storage device with ext4

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Message-ID: <20160113090608.GB14630@quack.suse.cz>
Date:	Wed, 13 Jan 2016 10:06:08 +0100
From:	Jan Kara <jack@...e.cz>
To:	"HUANG Weller (CM/ESW12-CN)" <Weller.Huang@...bosch.com>
Cc:	Jan Kara <jack@...e.cz>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: which IO-scheduler is best for flash based storage device with
 ext4

Hi,

On Wed 13-01-16 06:33:28, HUANG Weller (CM/ESW12-CN) wrote:
> Could you tell me which  IO-scheduler is best for flash based storage
> device with ext4 ?  Just search from WWW, I saw it is said that the noop
> is best because the CFQ is design for the mechanical hard disk.  And I
> did the performance test with IOzone between the IO-scheduler noop and
> cfq. The performance difference is small.  So here I want to get some
> answer from you about this question.

Yes, CFQ is meant for classical rotational disk. For normal SSDs I use
deadline IO scheduler (it does more request merging, prefers read over
writes), for high-end I'd use noop.

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR
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