linux-kernel - Re: [PATCHSET block#for-2.6.36-post] block: replace barrier with sequenced flush

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Message-ID: <20100823124815.GA20095@lst.de>
Date:	Mon, 23 Aug 2010 14:48:15 +0200
From:	Christoph Hellwig <hch@....de>
To:	Tejun Heo <tj@...nel.org>
Cc:	Ric Wheeler <rwheeler@...hat.com>, Christoph Hellwig <hch@....de>,
	jaxboe@...ionio.com, linux-fsdevel@...r.kernel.org,
	linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	James.Bottomley@...e.de, tytso@....edu, chris.mason@...cle.com,
	swhiteho@...hat.com, konishi.ryusuke@....ntt.co.jp,
	dm-devel@...hat.com, vst@...b.net, jack@...e.cz, hare@...e.de
Subject: Re: [PATCHSET block#for-2.6.36-post] block: replace barrier with sequenced flush

On Mon, Aug 23, 2010 at 02:30:33PM +0200, Tejun Heo wrote:
> It might be useful to give several example configurations with
> different cache configurations.  I don't have much experience with
> battery backed arrays but aren't they suppose to report write through
> cache automatically?

They usually do.  I have one that doesn't, but SYNCHRONIZE CACHE on
it is so fast that it effectively must be a no-op.

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