linux-kernel - Re: [PATCH-RFC] cfq: Disable low

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Message-Id: <20091127133511.A7DB.A69D9226@jp.fujitsu.com>
Date:	Fri, 27 Nov 2009 13:36:20 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	kosaki.motohiro@...fujitsu.com, Jens Axboe <jens.axboe@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Frans Pop <elendil@...net.nl>, Jiri Kosina <jkosina@...e.cz>,
	Sven Geggus <lists@...hsschwanzdomain.de>,
	Karol Lewandowski <karol.k.lewandowski@...il.com>,
	Tobias Oetiker <tobi@...iker.ch>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Rik van Riel <riel@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Stephan von Krawczynski <skraw@...net.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH-RFC] cfq: Disable low_latency by default for 2.6.32

> Signed-off-by: Mel Gorman <mel@....ul.ie>
> ---
>  block/cfq-iosched.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
> index aa1e953..dc33045 100644
> --- a/block/cfq-iosched.c
> +++ b/block/cfq-iosched.c
> @@ -2543,7 +2543,7 @@ static void *cfq_init_queue(struct request_queue *q)
>  	cfqd->cfq_slice[1] = cfq_slice_sync;
>  	cfqd->cfq_slice_async_rq = cfq_slice_async_rq;
>  	cfqd->cfq_slice_idle = cfq_slice_idle;
> -	cfqd->cfq_latency = 1;
> +	cfqd->cfq_latency = 0;
>  	cfqd->hw_tag = 1;
>  	cfqd->last_end_sync_rq = jiffies;
>  	return cfqd;

Great. Probably we can reenable this feature at 2.6.33. but there isn't any reason to take
any risk at 2.6.32. i.e. This simple disabling is best. I like this.

	Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>



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