* which IO-scheduler is best for flash based storage device with ext4
@ 2016-01-13 6:33 HUANG Weller (CM/ESW12-CN)
2016-01-13 9:06 ` Jan Kara
0 siblings, 1 reply; 2+ messages in thread
From: HUANG Weller (CM/ESW12-CN) @ 2016-01-13 6:33 UTC (permalink / raw)
To: Jan Kara, linux-ext4@vger.kernel.org
Hi,
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.
Thanks.
Huang weller
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: which IO-scheduler is best for flash based storage device with ext4
2016-01-13 6:33 which IO-scheduler is best for flash based storage device with ext4 HUANG Weller (CM/ESW12-CN)
@ 2016-01-13 9:06 ` Jan Kara
0 siblings, 0 replies; 2+ messages in thread
From: Jan Kara @ 2016-01-13 9:06 UTC (permalink / raw)
To: HUANG Weller (CM/ESW12-CN); +Cc: Jan Kara, linux-ext4@vger.kernel.org
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@suse.com>
SUSE Labs, CR
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