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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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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