linux-kernel - Re: [RFC][PATCH] libata: enable SATA disk fua detection on default

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Message-ID: <20120509082527.GA10674@infradead.org>
Date:	Wed, 9 May 2012 04:25:27 -0400
From:	Christoph Hellwig <hch@...radead.org>
To:	Robert Hancock <hancockrwd@...il.com>,
	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org,
	linux-scsi@...r.kernel.org, Jeff Garzik <jeff@...zik.org>,
	Zheng Liu <wenqing.lz@...bao.com>
Subject: Re: [RFC][PATCH] libata: enable SATA disk fua detection on default

On Wed, May 09, 2012 at 02:19:56PM +0800, Zheng Liu wrote:
> disable FUA detection for SATA disk.  If FUA feature can be used, we
> could disable io_barrier to improve the performance.  Now one solution

You can't run with -o nobarrier just because the driver/hardware support
FUA.  However the implementation of -o barrier (aka REQ_FUA) is a lot
more efficient if it is implemented.  If your workload has a high
percentage of REQ_FUA requests it might be better to switch the disks to
write through mode entirely.

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