linux-kernel - Re: [PATCH] cfq-iosched: Add documentation about idling [V2]

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Message-ID: <4E3B9F2C.7080809@fusionio.com>
Date:	Fri, 5 Aug 2011 09:43:40 +0200
From:	Jens Axboe <jaxboe@...ionio.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Shaohua Li <shaohua.li@...el.com>,
	Suresh Jayaraman <sjayaraman@...e.de>,
	Moyer Jeff Moyer <jmoyer@...hat.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH] cfq-iosched: Add documentation about idling [V2]

On 2011-08-02 19:40, Vivek Goyal wrote:
> There are always questions about why CFQ is idling on various conditions.
> Recent ones is Christoph asking again why to idle on REQ_NOIDLE. His
> assertion is that XFS is relying more and more on workqueues and is
> concerned that CFQ idling on IO from every workqueue will impact
> XFS badly.
> 
> So he suggested that I add some more documentation about CFQ idling
> and that can provide more clarity on the topic and also gives an
> opprotunity to poke a hole in theory and lead to improvements.
> 
> So here is my attempt at that. Any comments are welcome.

Applied, thanks.

-- 
Jens Axboe

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